Coz im very beginner, another question

Since i cannot transfer via owncloud big files.
What system can i use then or is advisable.
And it should be safe. Is there a way to only use webbrowser.
Example. Im anywhere and i want to send a big file (2gb up to 10-20GB) over webbrowser to my owncloud webstorage at home.
Without installing a software on the computer on which i upload the file.
FTP torrent over webbrowser?
Thx for help still running with the 10000. new setup of dietpi hehhehe. Webdav with https with windows 10 explorer not working.... user coudnt identified.
Your Software is really great
