For small files with no hassle, any instant messenger app like Telegram, Google Chat, FB Messenger etc where you can send photos, videos, files to yourself.

For massive files at home, I own a Synology NAS hosting a SMB network folder. I drag files in and they transfer at ~1gbps in theory, a bit slower in practive.

For massive files on the go, I turn on mobile hotspot then use Total Commander in "Wi-Fi transfer" mode. Also ~1gbps in theory, a bit slower in practice. You use your browser to upload/download the files on the mac side.

Options I avoid because they suck: GDrive (slow and limited by internet speed), All those "snapdrop" "peardrop" "wormhole" etc sites. They promise a lot more than they deliver. They're usually slow and finicky.