In TYPO3 9 and default_upload_folder 1.1.1 everything was working fine. But since update to TYPO3 10 and default_upload_folder 1.2.6 (but all versions after 1.1.1 seem to have the bug, I also tried 1.2.2) most editors don’t see the upload button anymore. Only the editors having the permission to a filemount in the second storage (non public) of the system can see the upload button (but the configured folder is not in that filemount and the user does have permission to the configured folder). I fixed it by just copying the file Classes/Hooks/DefaultUploadFolder.php from 1.1.1.
In TYPO3 9 and default_upload_folder 1.1.1 everything was working fine. But since update to TYPO3 10 and default_upload_folder 1.2.6 (but all versions after 1.1.1 seem to have the bug, I also tried 1.2.2) most editors don’t see the upload button anymore. Only the editors having the permission to a filemount in the second storage (non public) of the system can see the upload button (but the configured folder is not in that filemount and the user does have permission to the configured folder). I fixed it by just copying the file Classes/Hooks/DefaultUploadFolder.php from 1.1.1.