File Manager, other apps unable to access Nextcloud documents

[gbakeman]

⚠️ Before posting ⚠️

• This is a bug, not a question or an enhancement.
• I've searched for similar issues and didn't find a duplicate.
• I've written a clear and descriptive title for this issue, not just "Bug" or "Crash".
• I agree to follow Nextcloud's Code of Conduct.

Steps to reproduce

When trying to open a file in Nextcloud using a file manager:

1. Use an app that supports opening files using a file manager app (such as KeePassDX opening a password database file)
2. Find the Nextcloud provider in the hamburger menu
3. Presented with an error (in my case, "Can't load content at the moment")

When trying to open the file using a third party app (KeePassDX) that had a URI at one point:

1. Select file from recently opened list
2. Receive an "Access to the file revoked by the file manager" and "Permission Denial: opening provider androidx.core.content ..."

Expected behaviour

Files and documents are presented without error

Actual behaviour

Multiple errors encountered

Android version

OxygenOS 9.0.16 (Android 9)

Device brand and model

Oneplus 6T

Stock or custom OS?

Stock

Nextcloud android app version

3.34.0

Nextcloud server version

31.0.9

Using a reverse proxy?

Yes

Android logs

1761492878.860 10248 30370 30784 D UriUtil : Take read permission content://org.nextcloud.files/external_files/emulated/0/Android/media/com.nextcloud.client/nextcloud/[my NC user]%40[my current, valid NC host]/passwords.kdbx
1761492878.861 10248 30370 30784 E UriUtil : java.lang.SecurityException: No persistable permission grants found for UID 10248 and Uri content://org.nextcloud.files/external_files/emulated/0/Android/media/com.nextcloud.client/nextcloud/[my NC user]@[my current, valid NC host]/passwords.kdbx [user 0]
1761492881.967 10047 27917 30837 W LastAccessedStorage: java.io.FileNotFoundException: Failed to find matching mRoot for Root{authority=org.nextcloud.documents, rootId=[my NC user]@[my old, invalid NC host]/nextcloud, title=Nextcloud, isUsb=false, isSd=false, isMtp=false} @ content://org.nextcloud.documents/root/[my NC user]%40[my old, invalid NC host]%2Fnextcloud
1761492882.051 10047 27917 28223 W Documents: Failed to load org.nextcloud.documents, [my NC user]@[my current, valid NC host]
1761492884.370 10047 27917 28223 W DocumentAccess: Couldn't create DocumentInfo for uri: content://org.nextcloud.documents/document/null
1761492884.391 10047 27917 27917 E GetRootDocumentTask: Cannot find document info for root: Root{authority=org.nextcloud.documents, rootId=[my NC user]@[my current, valid NC host], title=Nextcloud, isUsb=false, isSd=false, isMtp=false} @ content://org.nextcloud.documents/root/[my NC user]%40[my current, valid NC host]

Note: Interestingly, both my current NC server host and my old, invalid host show up in these log entries. Some time ago I migrated my data to a docker container and changed the hostname along with it. I cleared out my old account info in the Nextcloud app and added the new account info. My third-party app has been using files from the new host.

Server error logs

Additional information

• "Content currently cannot be loaded" in Android Files manager app (storage access framework) #9906
  • Almost exactly like this issue, although a fix was apparently released that subsequently closed the issue. Must be different than what I'm experiencing now.
• Nextcloud on Android 12 doesn't show app in file manager #10249
  • Less relevant - Nextcloud does still show as an option in the file manager.

[gbakeman]

I tried a solution inspired by a comment in #9906: the author had tried uninstalling the app and reinstalling. Whereas I had only removed the old account from within the app's interface, something I hadn't tried yet was deleting the application data. Once I did this, I am now able to access Nextcloud files throughout the phone just as I had done before. It seems like something within the application data is not being cleared properly when an account is removed.

[gbakeman]

I want to add that after upgrading to the release candidate versions of the 33.1.0 release, the problem had returned. However, after upgrading to the full 33.1.0 release, this immediate problem seems to have resolved its self again.

[gbakeman]

Update again: problem is remaining persistent. As of app version 33.1.0, I'm still seeing the "Can't load content at the moment" error when trying to browse Nextcloud in an open file dialog using the file manager.
Edit: Once again, clearing all app data and setting it up has restored file manager functionality, at least for now. Seems to be some kind of corruption or bug with something the app is storing.

[HammyHavoc]

Seeing this issue too when attempting to back up Google Health data on a schedule into Nextcloud.

[gbakeman]

I want to add that rebooting my device seems to make Nextcloud happy again for some amount of time, can you try that and see if it helps?

[HammyHavoc]

I want to add that rebooting my device seems to make Nextcloud happy again for some amount of time, can you try that and see if it helps?

No joy with any of three reboots, unfortunately. :- )