Hi @FMKatz, thanks for messaging the Community!
If you use the 'email to Dropbox' feature, you can send emails to your account with an attachment (not in the body of the email) and it'll appear on your account.
If you need any further assistance, please let me know!
Currently, there isn't a method to directly access a link to then upload it to Dropbox. There may be some third party apps or services that can perform this to then upload it to Dropbox.