Hi @ChrstnMchl, I'm having the same dilemma like you. Surely using Skitch would be good but when it come to fill a form in PDF like to sign a signature, i think other app would be good like Adobe or even Write To PDF. As you know, the problem is, once you edited the doc, it will not auto save the PDF in the note but instead save in the internal storage of the phone. And you need to re-attach it to note again, which is tedious.
Still looking a way which app or other solution to this. Docusign is a good tool but have to pay if you are a frequent user to send document to get signature.