Hi @IBN
Did you upload images in Teams channel or just send images to others via chat?
Conversations that are part of a Teams channel are stored in the mailbox that's associated with the team. Similarly, files that team members share in a channel are stored on the team's SharePoint site. So please make sure you have added the team mailbox and SharePoint site as a content location to search conversations and files in a channel.
For more details about how to building a search query, you could learn it from:
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