How to delete old tags
click the "+" button -> hover and click the tag you want to delete.
How to change the created time of a memo
ALT + click the datetime of a memo on the top left corner.
How to upload videos in Memos
You can upload videos up to 32 MB in size. In addition, the video must be compatible with HTML5. See more in https://www.chromium.org/audio-video/