Is it possible to upload files with .p7s extension?

File extensions allowed: 'p7s'

se poate si asa ?

I am not sure if I have understood your question correctly. Do you want your users to be able to upload ".p7s" file format? 

Yes it is possible to achieve this. You need to add "File Types" in the file upload field options and you should be able to upload files with .p7s extensions. Please check the screenshot below:

Hope this help.

Do get back to us if you meant to ask something else.