Hello, why cant i upload movies into Premiere elements 2023? The movies are around 2 GB and in MP4.

MP4 is a wrapper, what is inside YOUR wrapper - Exactly what is INSIDE the video you are editing?
Report back with the codec details of your file, use the program below
Free program to get file information for PC/Mac http://mediaarea.net/en/MediaInfo/Download
- a MediaInfo tutorial https://youtu.be/Ivy9ckSX1M0
- when you analyze your file in MediaInfo and post a screen shot in the forum, do so in TREE view
- post your information IN your message, not as an attachment that someone would have to download

PS - uploading is copying a file from your computer to an Internet site... you are trying to Import

Post screenshot of error message in the entire UI.

also post screenshot of clip in MediaInfo info in Treeview

https://mediaarea.net/en/MediaInfo