Erna You can just copy-paste it into the text field and it will upload the image to bunq's servers and embed it. But of course, your link also works :)
That error message seems to be quite generic and at least I cannot find any specific reason on the internet for why it would appear. Maybe other Android users on here have some more information or ideas. As it seems to be a general issue with your device, you could try to see if there are any system updates or bugfixes available, and if that doesn't help reach out to the manufacturer's support as you need to get Google Pay working.
