Duplicated images on external storage

[sysoppl]

Actual behaviour

When images are uploaded to external storage (ostack in my case), they are duplicated in gallery.

Expected behaviour

Images should not be duplicated

Steps to reproduce

1. Upload files to external storage:
   

2. Open "photos" from menu

3. Images are duplicated:
   

After that, when I go back to the folder with uploaded files, for short amount of time they are showing like this:

and when it refreshes, they're back to normal (3 files)

In browser everything is showing good.

When images are on internal storage, they are showing as they should.

Environment data

Android version: 6.0

Device model: Lg K350

Stock or customized system: stock

Nextcloud app version: 3.0.1

Nextcloud server version: 13

[AndyScherzinger]

Thanks for your report @sysoppl!

Im closing this issue as a duplicate in favor of #1698 since this is the case for images and favorites.

[AndyScherzinger]

PR is #2490