I currently have to convert pdf with software before uploading to Amazon each time. I find this tedious because Shipstation is suppose to help with this stuff.
New
Amazon needs a jpg or png for return labels
weird hack but works with Amazon updates as of August 2022
Copy paste order number, use Shipstation's return > Email Return (but first make the below changes)
Edit Sales Channel > Amazon
Branding > Company Name
Include [Important] (with brackets) at the end of the company name
With the bracket flag, return labels emailed from Shipstation will now process through Amazon's filter
Must have [Important] in the subject of the email and that's the only way I've seen to edit Shipstations Email Subject for Returns
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