Support When I upload add-on to may Forum I get this notice

[kas20]

"Could not process ...: File does not appear to be a valid add-on archive as expected".

How to fix this

 

[AbsoluteZer]

with your FTP you have to upload the contents of your upload folder, example if in this folder you have a "src" and "styles" folder you have to select these folders and drag them into the directory where is installed your xenforo (htdocs, www, etc...)
I don't know if I'm clear enough, tell me if you need screens

 

[Quick87]

"Could not process ...: File does not appear to be a valid add-on archive as expected".

How to fix this

Try setting on admincp:
/admin.php?options/groups/attachments/
And input the extension files in: