xls / pdf files with swap lists to send by messages

I didn't find if this was discussed ever but can it be possible to add an option to send the swap's lists in xls / pdf files via PM as sometimes users ask for that or bad idea? 

Since all my doubles are only in xls format, I find the suggestion is OK!

Perhaps can be created a “file storage” (similar to photo storage, or mixed with this), for upload files with swap lists (text mode, excel, pdf...).

When you send a message you can add a link to your file, instead of create an “attachment management”.

Really you can do this with systems of store files in the cloud. In my case, I have my collection on Numista (for now only coins) and a spreadsheet on Google Drive (with all my collections).

https://en.numista.com/forum/topic82841.html#p767818