“no_file_data” error when trying to upload file to slack

Question

when I try to upload any kidn of file through my SlackApp(via c# using HttpClient), I allways get the following response:

{\"ok\":false,\"error\":\"no_file_d         


        

Answer 1

I was running into the no_file_data error as well. I found out you the file needs to exist AND it needs actual content inside. Make sure to do a size check or content length check in addition to the file exists check before uploading