Hey @Proficient - welcome to the community!
This would vary a bit on where / how you’re trying to upload the file from. We support uploading any file that the file column supports on monday, as long as it’s uploaded as a multi-part file.
The easiest way to see this would be through Postman, as you can choose a file to upload and Postman will take care of the rest. You can see an example of it in the post below:
You can also use something like cURL to accomplish this:
--form 'query=mutation ($file: File!) {
add_file_to_update (file: $file, update_id: xxxx) {id}}' \
--form 'variables[file]=@/Users/danny/Downloads/big-image.png'
Hope this helps!
-Daniel