Here are some of the options:
Rev. 12/07/2021
Except for emailed files, please notify me that files are there.
Server/Host: home117533535.1and1-data.host
Protocol: SFTP
Port: 22
Username: u37476601-ftp
pw: uploads
After login, change to one of the unused folders (a, b, c, ...), and transfer your files.
(Since FTP is deprecated in most browsers, an FTP client is needed to use FTP.)
For more details on using psftp on Windows: howto_psftp.htm
For pictures, full-resolution jpeg/jpg is preferred.
For videos, landscape is preferred.