Outlook App on iOS 15.4 error: image can't be saved to draft.

[CCifaldi]

Good morning,

While replying to a long email chain from my Outlook App (running on iOS 15.4) I received this popup error message "Cannot Send Email Image .png can't be saved to draft. Please contact support." 

The problem comes from the .png images of the signatures.

Thank you in advance for your support.

[#2]

@CCifaldi Just to add in, the problem can be found when attaching jpg documents as well, not just the signature png files.