# Error messages > Look up a message from Neo Product Catalog Flipbook to see what it means and what to do next. Source: https://docs.neoflipbook.com/troubleshooting/error-messages/ App: Neo Product Catalog Flipbook Last updated: 2026-10-01 This page lists the messages you might see in Neo Product Catalog Flipbook and in the theme editor, grouped by area. Messages are quoted exactly. Where a message includes a number or a name, the table shows an example. ## Creating and saving | Message | What it means | What to do | | --------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------- | | “This flipbook could not be saved” | Something in the form needs fixing. The items are listed under this heading. | Fix each item, then save again. | | “The title field is required.” | The **Title** field is empty. | Enter a title, up to 200 characters, on the **General** tab. | | “Action failed” | Something didn’t work. The reason is shown under this heading. | Follow the reason shown, then try again. | | “Still connecting this store to the flipbook server. Try again in a moment.” | You’ve just installed the app and it’s still finishing setup for your store. | Wait a minute, then try again. | | “A service this app depends on could not be reached. Nothing was changed. Try again shortly.” | The app couldn’t reach a service it needs. Nothing was saved. | Wait a few minutes and try again. | | “Could not reach the server. Check your connection.” | Your browser lost its connection to the app. | Check your internet connection and try again. | | “Request failed.” | The app couldn’t finish what you asked. | Try again. If it keeps happening, [contact support](https://docs.neoflipbook.com/troubleshooting/contact-support/). | | “Couldn’t copy” | Your browser blocked a copy button, such as the one for the **Public link** or **Embed code**. | Select the text in the field and copy it yourself. | ## Uploads and links | Message | What it means | What to do | | --------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------- | | “This file is larger than Shopify’s 20 MB limit, so it will be saved to Managed storage.” | Shopify Files takes files up to 20 MB, so the file goes to Managed storage instead. | Nothing. Click **Upload**. | | “Files over 100 MB can’t be uploaded.” | The file is over the 100 MB limit. | Make the file smaller, or host it yourself and [use a link to it](https://docs.neoflipbook.com/files/paste-a-link/). | | “Only PDF, JPEG and PNG files can be uploaded.” | The file isn’t a PDF, JPG or PNG. | Save the file in one of those formats, then upload it again. | | “Shopify is still processing this file. Try again shortly.” | Shopify needs longer than usual to get the file ready. It’s still being added to your Shopify Files. | Wait a minute, reload the page, then pick the file from **Your files**. | | “Shopify rejected the upload.” | Shopify refused the file. | Try again. Check that the file opens on your computer. | | “The upload was rejected. Try again.” | Managed storage refused the file. | Try again. Check that the file opens on your computer. | | “Upload did not complete.” | The file didn’t finish arriving in Managed storage. | Upload it again. | | “Upload failed.” | The upload stopped, usually because the connection dropped. | Check your internet connection and try again. | | “Could not load files.” | Your list of files couldn’t load. It appears under the heading “Could not load files”. | Reload the page. | | “Paste a link to a PDF.” | The **PDF link** field is empty. | Paste a link, then click **Add PDF**. | | “Paste at least one image link.” | The **Image links** field is empty. | Paste one link per line, then click **Add images**. | | “Enter a link starting with [https://.”](https://.%E2%80%9D) | The link doesn’t start with `https://`. | Copy the full address, including `https://`. | | “This link answered with 404. Check the address.” | The website didn’t return the file. The number can differ. | Open the link in your browser to check the address. | | “This link doesn’t lead to a PDF file. Use a direct link to the file, not a page that shows it.” | The link opens a web page, not the PDF. | Use a link that opens or downloads the file itself. | | “This link doesn’t lead to an image file. Use a direct link to the file, not a page that shows it.” | The link opens a web page, not the image. | Use a link that opens the image file itself. | | “This link can’t be loaded in a browser. Check the address, or upload the file instead.” | The address is wrong, or the website hosting the file doesn’t allow other sites to load it. | Check the address. If it’s right, [upload the file](https://docs.neoflipbook.com/files/upload-a-file/) instead. | ## Product catalogs | Message | What it means | What to do | | ------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------- | | “This catalog could not be built” | **Build catalog** didn’t work. The reason is shown under this heading. | Follow the reason shown. | | “That selection has no active products in it. Pick something else, or publish the products you meant.” | Everything you picked is draft, archived or unlisted, or the collections have no active products. | Set the products to **Active** in Shopify, or pick others. | | “Could not read your products. Try again in a moment.” | The app couldn’t read your products from Shopify. | Wait a moment, then click **Build catalog** again. | | “Could not open the Shopify picker. Try again.” | Shopify’s product or collection picker didn’t open. | Click the button again. If it keeps happening, reload the page. | | “The products could not be updated” | A change to the catalog’s products didn’t go through. The reason is shown under this heading. | Your catalog stays as it was. Follow the reason shown. | | “Could not read your products, so the catalog was left as it was.” | The app couldn’t read your products, often after many changes in a row. | Wait a minute, then make the change again. | | “That selection has no active products in it, so the catalog was left as it was.” | Your new selection has no active products. | Pick active products, or set the products to **Active** in Shopify. | | “Could not open the Shopify picker, so the catalog was left as it was.” | Shopify’s picker didn’t open. | Click the button again, or reload the page. | | “A catalog holds up to 250 products, so only the first 250 are included.” | Your selection has more than 250 products. | Split your products across two catalogs. | | “3 picked items were skipped because they are not active or no longer exist.” | Some products are draft, archived, unlisted or deleted. | Set them to **Active** in Shopify, then click **Refresh product data** and **Save**. | | “3 products have no online store page, so their cards are not clickable.” | Those products aren’t available on your online store. | Make them available on the **Online Store** sales channel, then refresh the product data and save. | | “Could not upload the cover image. Try again.” | The cover image didn’t upload to your Shopify Files. | Try again, or try a different image. | | “The Line sheet template cannot lay out that many products per page.” | The **Products per page** value doesn’t fit the **Line sheet** template. | Choose 4, 6 or 9. | | “The Lookbook template cannot lay out that many products per page.” | The **Products per page** value doesn’t fit the **Lookbook** template. | Choose 1 or 2. | ## Preview | Message | What it means | What to do | | ------------------------------------------------------ | ---------------------------------------------------------------------- | --------------------------------------------------------------------------------- | | “Preview unavailable” | The preview couldn’t be shown. The reason is shown under this heading. | You can keep editing. Change back the setting you changed last. | | “These settings could not be previewed.” | The viewer can’t show this mix of settings. | Change back the setting you changed last. | | “No preview to show while these settings are invalid.” | A setting has a value the viewer can’t use. | Correct the setting. | | “Could not build a preview.” | The preview couldn’t be created. | Reload the page. | | “Could not update the preview.” | Your latest change didn’t reach the preview. | Make the change again. If it keeps happening, save your work and reload the page. | | “This preview has expired.” | The page was open for a long time. | Nothing. The app builds a new preview by itself. | ## Plans and limits | Message | What it means | What to do | | -------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------- | | “Choose a plan to create flipbooks.” | Your store has no plan. You need one, even Free, to create flipbooks. | Click **View plans** and choose a plan. See [Choose a plan](https://docs.neoflipbook.com/getting-started/choose-a-plan/). | | “You’ve used 2 of 2 flipbooks on the Free plan.” | You’re at your plan’s flipbook limit. Hidden flipbooks count. | Delete a flipbook you don’t need, or click **Upgrade**. See [Flipbook limits](https://docs.neoflipbook.com/billing/flipbook-limits/). | | “That would be one flipbook more than your plan allows, so nothing was created.” | Another flipbook was created at the same moment and used your last slot. | Check your **Flipbooks** list, then delete a flipbook or upgrade. | | “Your Free plan shows the first 25 pages.” | Shoppers will see only the first 25 pages of this flipbook. Your full file stays saved. | Upgrade to show every page. See [The 25-page limit](https://docs.neoflipbook.com/billing/page-limit/). | | “Without a plan, customers see the first 25 pages.” | Your store has no plan, so the Free plan’s limit applies. | Choose a plan. Basic and Pro show every page. | | “Your Free plan shows 25 pages” | This asks before you create a long flipbook. | Click **Upgrade now** or **Create anyway**. Either one creates the flipbook. | | “We’re confirming your plan with Shopify” | Shopify hasn’t confirmed your new plan yet. | Reload the page in a moment. | ## Theme editor These notices appear only in the theme editor. Shoppers never see them. | Message | What it means | What to do | | ---------------------------------------- | --------------------------------------------------------------------------------------------- | -------------------------------------------------------------------- | | “No flipbook selected.” | The **Neo Flipbook** block has no flipbook picked. | Choose one in the block’s **Flipbook** setting, then save the theme. | | “You haven’t created any flipbooks yet.” | Your store has no visible flipbooks. This also shows when every flipbook is hidden. | Create a flipbook or make one visible, then reload the theme editor. | | “Lightbox is not included in your plan.” | Your store has no plan, so the block shows the flipbook on the page instead of in a lightbox. | Choose a plan, then reload the theme editor. | ## Files | Message | What it means | What to do | | ----------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | “This file is used by Spring Catalog and Lookbook. Remove it from those flipbooks first.” | You tried to delete a file on the **Assets** page that flipbooks still use. Hidden flipbooks count. | Remove the image from each flipbook’s **Pages** tab and save, or delete the PDF flipbook. See [Manage files on the Assets page](https://docs.neoflipbook.com/files/assets-page/). | Don’t see your message? [Contact support](https://docs.neoflipbook.com/troubleshooting/contact-support/) and include the exact text.