Hello @JayS7667 ,
The text should remain in the type-able area if it's sticking. Are you editing the alt text for these images in the email editor itself or in your Library? Do you explicitly click the blue Save button after adding/editing the alt text, or do you click outside of the pop-up screen for it?
When I was testing in your account and my own, I was noticing that the changes to the alt text stuck when editing directly through the Library tab. However the insert / replace image window wasn't keeping those same edits after hitting the save button and then hitting the insert button, even if the image was already in the campaign. Is this your experience as well?
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