Export and save issues

having all sorts of issues . Using windows 11 with a recent version of audacity
. 1 . When i save a file it goes into a folder as an aup file, but when I try to retrieve, I’m told that type of file can’t be opened in audacity. Why does it save in a format that it can’t open?
2. When trying to export a project with multiple tracks, they all combine and when opened the wave pattern is a solid block with the audio all muddled and clipped. What happened as I’ve never had this issue before
3. When working on several tracks { overdubs } how can I remove one track and the bring it back to the project later ?
Thanks in advance for your help

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