Error when uploading a cover to a VK group?

Question

PHP

//resolved
As a result, I get the following error: skrinshoter.ru/s/180317/DkjtIE
What could be the error? The download link eats up, the hash gives out - but does not want to save)

Answer 1

Upload a photo in the body of the post request. In the field photo. How to implement - there is literally in the next question How to upload a photo through VK api?
The most important thing is that you are loading in the file1 field, although the VK documentation clearly states that you need to load in the photo field.