I do not think you can replace an attachment to an existing post however, you as owner could delete just the attachment and edit the original post to say see reply with attachment, then reply to that post with the new attachment
The group would receive the reply with new attachment but you can explain the reason for that
Nivard Ovington in Cornwall (UK)
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On 06/05/2025 11:12, Barry via groups.io wrote:
Have been asked whether it is possible to replace a photo/attachment in an existing thread & outside of a private album. All I can see is to delete the thread completely, but by doing this any new thread/photo will no longer be in sequence. As an owner of the group - I do not think even I can do this ? barry