similar to

https://support.box.com/hc/en-us/community/posts/4414737160595-Linking-files-already-uploaded-to-Box

but has no answers anymore

link a file in thunderbird - uploaded - ship mail

now ship mail to someone else and try to link the same file - error

can I just ship the url to the  existing file or how do you handle this case ?

best regards, Guy