Thunderbird Filelink 100mb over problem

Hello, I have installed nextcloud on synology.
I can upload files through Nextcloud’s own interface without any problems. No problem. I tried uploading 250mb file and it works fine.

But it does not add files over 100mb via Thunderbird-filelink. It gives an error. “Failed to load file xxx.rar to service yyy.” it gives error like this.