Upload lot of files from SMB share to web gui fails


I’m trying to move all my photos stored on my NAS to my nextcloud instance. I’m trying to copy photos (thousands of them) from an SMB share to nextcloud though the web interface using firefox.But it fails with lot of errors and freezes the web browser.

Doing the same but copying first the photos to my desktop works just fine.

Is there any known issue when copying files from a network share ?