Switch is probably the closest thing I can think of for what you are looking for. It works with Evermore and uploads right to your account from Skitch when finished. I know you can take photos from inside both Evermore and Skitch. I couldn't tell you about screencaps, as I have never had a need to do anything like that. If you don't have Evernote or tried it, I would give it a try, it works well for work stuff, you can send notes right to people and they can open them without a password or anything but only someone with the direct link can see it and you can always edit it later to make it private again, and they just added a new nifty feature that allows you to chat with anyone, whether or not they have an account, right inside a note. So you can be sharing markups and chat about them at the same time inside the note with the markup. It might be something worth looking into. There's also the OneNote app, it lets you write with your finger, but there's no in app camera ability, so you would have to open the picture up in the app, and takes a few more steps than Evernote to share with others. Beyond that, I can't think of anything that's note a full photo editing app. It's unfortunate how limited the Google Drive app is too, because on PC, you can create and edit all types of documents inside Google Drive and share with anyone. If their app did that, even in a limited way, it could have been another good option. Unfortunately I can't give any advice on how each one works with screen caps, but Skitch is the quickest route from capture to inside app, I believe. And it has the least frills, visually, which is actually a plus in my book, the "cleaner", less busy apps seems to open faster and run faster and more responsive than ones full of options you'll likely never use. Oh, and it does PDF files too (oops, that's a Premium feature. But Premium is pretty cheap for a year and I think worth it.) It also lets you Mark up webpages and maps that you open up directly inside the app, which is pretty cool.
Sent from my KFTHWI using Tapatalk