Unsupported mimetype ('application/octet-stream') from Go SDK Images.Edit

Hi!
Please help me
I am using openai go sdk and trying to call “Images.Edit”(/v1/images/edits)
But I get the error “Invalid file ‘image’: unsupported mimetype (‘application/octet-stream’). Supported file formats are ‘image/jpeg’, ‘image/png’, and ‘image/webp’.” although I pass png image
I tried different ways, but I could not get the correct answer

Could you please provide an example of code that would work
Thank you very much!