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I really loved your camera type though it was 35 years ago I had one. I envy you.
Not sure why you should be having trouble unless you have a bad film. Have you tried more than one film?
If the film cassette has dropped in properly and is laying flat, the film rewind has to be raised, I think, to allow that and the sprocket holes in the film are properly engaged with the sprockets and the free end of the film engaged onto the film wind-on reel then everything should be well below the door aperture.
I would wind on maybe a frame and fire the shutter prior to closing the film door just to observe everything moving as it should and then close the door.
The last quarter inch the door must be closed against the pressure of a spring but if the little spring-loaded device behind the door which is intended to keep the film perfectly flat against the camera body is working correctly only a light pressure will be needed to compress those springs and close the door.
Perhaps something is wrong there?
I don't remember any problems closing the film door.
I hope this helps but if it doesn't please come back again and describe your actions and the feel of the door more fully.
Without seeing this, I can't really tell it might be that the rear door is slightly bent OR the light seal(s) are preventing the door from closing properly.
When you close the back on the camera it should close without force or pressure to latch, should be a nice crisp click. If once you have the back closed and you cn pinch down on the bck and it moves inward towards the camera then the seals are worn out and need replacing. This isn't a huge job it's one of the more common things with a film camera. I'd say probably a $60.00 fix depending on where you are and most camera repair shops do this.
There could also be several other things that caused the camera to not expose one being the battery could be exhausted (dead) and requires a new one (cheap and available) another is the aperture blades in the lens could be stuck open.
Have a service person check it out before loading more film
remove and reinsert battery. be sure you pulled the film all the way across the back. be sure the door latches. be sure camera is on. try the rewind button, it may think it has film in it, ready to rewind. Still no good? film advance motor may be dead. If so, it needs repair. Lucky for you, the Maxxum 50 goes for cheap on Ebay. You can get another at a good price.
You don't need to open the camera to change the film. The battery door is on the other end. You open the door by inserting the protrusion on the plastic end piece of the strap into the slot of the battery door. It takes a small 3 volt battery.
bottom of camera open battery cover with a pen point, insert one AA battery close cover.
film door is opened with pen point left side of film door. load film & bring film leader to take up spool, close film door. rotate advance to # 1 counter on bottom.
turn camera on with sliding switch on front of camera, this opens lens cover and turns on flash .( if wanted ) second click.
at end of film roll pull rewind lever up and rotate clock-wise to rewind film.
open film door and remove film.
remember to turn camera off when not using.
When you say "brand new" film, the battteries could easily be dead (or too low) if this is old, unused film. The camera's batteries are in the film pack....
I don't think true SX-70 film has been made for years. There is one Austrian company making film for it or people adapt newer film packs to it (read-up on internet).
First thing is to see if the contacts are clean and then to check the battery voltage in the film pack.
You could have battery contacts (in the camera) that need cleaning. Clean contacts with a pencil eraser, scotchbrite or very fine sandpaper.
Try looking online for voltage information. It might be helpful if you can check that.