Red_sun_in_the_sky [any]

No its pretty good for both. You can transfer large files pretty well without any break. I don’t know what your grievance is. It is solid for file transfer.

Syncthing is for making backups from a source and keep copies in several devices. Its very solid to send large files. It syncs any changes to files in the source to the backup locations.

Syncthing is the only decent one I used. Kde connect is wonky.

Localsend is pretty bad.

Other commenter already pointed to shotcut. I second that. I used it for a long time its solid. So is kdenlive. Check em out.