It seems that you can comment a picture, not a sequence. And you need to find this picture to read the comment. So I don't think it's useful for this type of use.
Yes, I can find a list of my uploads, but seeing the first picture is not enough and usually uninformative.
The upload date could help, but with the pictures date, the bounding box, and the comment, it could be really better.
If I ask these features is because sometimes there is weeks or months between the capture time and the upload date, and I don't always remember what I've already uploaded. Add to this that I still have many indoor pictures to send (same localisation, but different levels), and I think that you will understand why it becomes difficult to track what is uploaded, and what is not.