drag and drop stopped working

Drag and drop files has suddenly stopped working on my 2020 macbook air. It is driving me crazy because I cannot figure out why. For files on my desktop, they are opening now instead of dragging. I have looked online at the trackpad settings and they are not set up sensitively and I have no idea how else to fix this. When I download things and for example want to select all and drop them into my google drive, they are all opening up instead. Is there another fix besides trackpad settings because that doesn't appear to be the problem. I did not do anything recently and I have downloaded the latest OS but this was happening before that and was not fixed by upgrading it.