Greetings and welcome @AwG 
We’re excited to have you as part of our community.
A million thanks for sharing your idea with us 
I do share your point and agree that these apps would be of a great help for many users. As for the Comments app, we do have it in our Coming soon project. Please vote for this app to get a notification upon its release.
Your suggestion to create Upload Button app is awesome as well. We’ll take it under consideration in our future updates.
Please do not worry, we’ll keep you posted here 