Please, I need to be able to use image files for signatures. I store multiple signatures and initials on DropBox as .png files and it is important that I can swap those signatures and initials as needed.
Sorry, this feature is not available in Fill & Sign application.
You can use Adobe Acrobat Reader mobile application for the same.
Please refer to the help document to get more information on this- Acrobat Reader Help for iOS: Creating Signatures and Signing
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