I have a triggered assigned to a project which runs when a file is uploaded, it works fine but if another users triggers the project it wont run. Is there a way I can get the project to either wait in a queue or run at the sametime

If the project is thread-safe ... then, under the Project level, set it to be Thread-Safe then they each will run concurrently.

if the project is not thread-safe ... then, create a single-threaded job queue and submit the trigger to the job queue. It will run independently and in the order they were received.