We would like to change our app logo as it appears in the Clover marketplace.
Attachments: Up to 2 attachments (including images) can be used with a maximum of 512.0 KiB each and 1.0 MiB total.
Have you tried logging into your developer dashboard? You should be able to do that from your app's market listing section.
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Timeline to Submit Application to the Market in 2020
Are Release Groups Working?
Web Apps Under Review for over 3 months
When is next Clover software update?