Error uploading a CSV file to adobe stock

I suppose that you have taken the example file to create the initil file headers. If not, use that, as it is crucial that the header is exactly what is in the template.

I have several remarks: 

1.  Unrelated to the failure: you upload PNG files, they need to have a transparent background. If they don't have, upload JPEG files. 
2. Your filenames start with a $, I would avoid special characters in filenames.
3. You add a release to each single file, and that name is the same as your description. I suppose that you do not have uploaded a release with that name beforehand. I indeed doubt that you need a release. So leave that field blank. The heading is needed!