With Yopp, we use 7 atomic actions to perform the task (see https://github.com/josephernest/Yopp/blob/master/README.md#m...).

I tried with WeTransfer and we have 10 taps/clicks + 16 alphanumeric characters to type on keyboard:

    Open browser on phone [1 tap], Open wetransfer page [1 tap if in bookmarks], "Take me to free" [1 tap], "I agree" [1 tap],   
    "Add your files" [1 tap], Choose the file [1 action], "..." round icon [1 tap], "Send as link" [1 tap], "Transfer" [1 tap].   
    Open browser on computer [1 double click], write URL [at least 16 alphanumeric keystrokes], e.g. we.tl/aqNXmKTjFO