I just did a multiple track project and can’t access many of the files. This might be because i was working with mp3s. i have since updated the lame mp3 thing but still can’t access files, which i see in library when i want to save other tracks. Is this library directly accessible? Please dont say i have to start over. 
Thanks.
Please tell us your version of Audacity (see the pink panel at the top of the page).
Sorry I don’t know what library you are talking about.
If you want to open saved Audacity projects, open the AUP file you saved. See http://manual.audacityteam.org/o/man/audacity_projects.html.
If you are talking about the iTunes Library, you can right-click or CTRL-click the file in iTunes, choose “Get Info” then click the File tab to see where the file is.
Show us a screenshot if the above doesn’t help: https://support.apple.com/en-gb/HT201361. Please see here for how to attach files: https://forum.audacityteam.org/t/how-to-attach-files-to-forum-posts/24026/1
Gale