cannot upload files with OAuth user

[krakazyabra]

Steps to reproduce

1. Install NC from docker container nextcloud:18.0.6-fpm
2. Use S3 storage as primary
3. Enable app Social Login
4. Login as SocialLogin user
5. Upload folder with files

Expected behaviour

The folder should be uploaded with all files

Actual behaviour

Flowupload shows, that files were uploaded. The folder was created, but there are no files inside

Server configuration

Operating system:
Debian Buster

Web server:
nginx 1.19.0
Database:

PHP version:
7.3.19

Nextcloud version: (see Nextcloud admin page)
18.0.6

Updated from an older Nextcloud/ownCloud or fresh install:
Doesn't matter, tried on both

Where did you install Nextcloud from:
Dockerhub

The logs are fine, no errors even in debug mode, no errors in browser console.

Tested with local user: everything is fine, no bugs. Folder appears with all files inside. Problem only with users, who use Social Login.

[e-alfred]

It is most probably not a problem with the type of user, but the storage type you use. S3 is currently not tested yet: #98

[krakazyabra]

Ok, then I'll be waiting for testing results