1. Fresh battery - although if this were the only problem, pressing the battery check button should release the mirror. Still a good idea to test with a very fresh battery.
2. In order to cock and fire the shutter without film loaded, you need to have the multiple exposure switch set to multi. So the situations with and without film are somewhat different. Perhaps there is something about your film loading or about the engagement of the film wind gears with the insert that is preventing the cycle from completing.
These cameras are battery reliant - check and clean the contacts. They work with the alkaline batteries, but prefer the longer lasting, more expensive and harder to find silver oxide ones (which were the most easily found back when the cameras were new).
The inserts and the bodies communicate in a number of ways - all mechanically. But the electricals also play a role when it comes to the safety interlocks.
Having film installed could affect the placement of an insert that is bent or damaged (or installed in a bent or damaged camera), which in turn could affect that communication, which in turn could affect whether the camera knows to lower the mirror.
If you were local, I would loan you another insert (in a socially distanced manner of course) to allow you to check to see if the insert is the source of the problem.
About the multi-exposure, yes, when I have no film inside, I use the multi-exposure mode to test if the camera is shooting properly (as I read in the manual).
How can the film insert prevent the mirror or shutter to not complete the cycle though? Aren’t the 2 things two separate processes? The film properly goes to the next frame and is set in position before shooting.
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