i’am trying to upload larger video files via drag and drop (on my local xampp server) but it doesn’t seem to work. I can see the spinner for 2-3 seconds and then it stops.
That depends on your hosting provider. If in doubt, you should contact them to find out and if necessary, change the provider. Sometimes, you cannot directly edit the php.ini but make change some settings via a web interface.
If you want to upload ~40MB files, you should probably set the upload_max_filesize to 64M.