I have an idea, give a like if was usefull for someone.
My trouble was I need to use the image content in a scenario to see as details report, and send it via e-mail, or in a view screen, but it doesn't return the image content, even in the app or flows.
So, I seen that the image content it's not in the image column, but there's accesible from the attachments column:
(Sorry of the design, it's just a test for my idea XD)

Where, I have a gallery(left) with the Datasource, and add an attachment card(mid) from a Form control, and I use a formula like Gallery.Selected.Attachments in Default property . Then, added a gallery(Right) to filter the files on the attachments card to get only image files (jpg, jpeg, etc).
Also, the filename on each file contains the column name, so, we can use a filter function to get the specific file of the column we want.
It means that we can get the image content from the attachments column =D, and use it to see on canvas apps, and maybe give us an idea to use for a flow or anyway you want.
Best regards for everyone.