Hi rickatk,
It sounds like you're having an issue viewing specific documents with Pages on your iPhone. If so, check out the information below also found in the article here: If you can’t find a document in Pages for iCloud - Apple Support
"Documents you create using Pages for iCloud appear in the Pages folder in the document manager (and in Recents, if the document was opened recently).
If you set up iCloud on your Mac computers, iOS devices, and iPadOS devices, and save your documents to iCloud Drive, your documents should also appear in the Pages folder in the iCloud document manager. If you don’t see a document, click Browse on the left side of the document manager to see if the document was saved to a different folder.
If you still can’t find a document you saved to iCloud Drive, try the following steps to make sure your computers and devices are set up to sync properly."
You can also check to make sure the document is listed with the help of the steps here: Open a document in Pages on iPhone - Apple Support
If your iOS is fully updated: Update your iPhone or iPad, and the issue continues after a normal restart of your iPhone and any devices that share the document in iCloud, reach out to Apple directly to report the issue and further assist. Get Support
Cheers.