@SP. Ok so for future reference how do I avoid this issue? Should I not import my project then, that is when it converts it to an MP3 file. Or is there a different way I should import it or save it?

@kemerin-s You can only edit the projects inside the application you used to create it in the first place.

If you want to import your project into another application and want maximum flexibility, I would recommend you export each audio track of your project as a separate audio file. This is usually possible by soloing a single audio track and then exporting the project as an audio file. The resulting audio file will only contain this single track. You can then import the single tracks individually into a new project.

If you stay inside the same application and want to copy tracks from one project to another project it is often possible to select and copy everything in one project and paste it into the other project after you loaded it (with the standard copy and paste commands). It depends on the application you use if this will work.

You can try a free tool like SpleeterGUI https://makenweb.com/SpleeterGUI if you want to spilt up your MP3 files into different audio stems. This can give you back some flexibility in remixing them. But be aware this tool needs a modern processor and a lot of RAM and your computer should have at least 8 GB of free(!) RAM. Alternatively you can use a website like splitter.ai