Support

Email support@udfyld.theill.com and I'll reply as soon as I can.

Where are the files I saved?

In the Files app under On My iPhone → Udfyld. They are also listed under Recent in Udfyld.

Is the original changed?

No. Udfyld saves a copy. The original is only overwritten if you tap Overwrite the original and confirm.

The recipient can't see what I typed in the fields.

Turn on Lock the fields when you save. The fields become part of the page, and every PDF reader shows the same.

How do I open a PDF from Mail?

Tap the attachment, tap Share and choose Udfyld.

How do I change my signature?

Tap Sign → Draw again, or go to Settings → Signature.