I just want to focus on the last part of this statement for a moment:
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If not then no big deal, but eliminating these extra steps (having to drag raw video files onto the mobile device for editing and then remove them to preserve space on said device. Especially since things can take awhile to transfer back and fourth)
That's actually a good reason to not work with clips that reside on your PC unless you're editing only a small section of very large clips.
Rather than waiting one time for them to transfer to your phone, every time you work with them while editing would require your phone to access them via USB or BlueTooth or Wi-Fi which could cause lagging. You'd also have to wait longer when producing for the app to access the clips over the interface.
With high resolution clips, the app will want to make shadow files. Those are stored on the phone and will be faster to use when editing, but it will still have to access each full clip when creating the shadow files over the slow connection.
It will need to access some portion of the source clips again when producing, so you're essentially trading off the one-time delay in transferring the clips at the start for a series of shorter (but ultimately longer duration) delays by keeping the clips on your PC.
If your phone has an easily accessible SD card slot, using that to transfer the video clips might save you some time overall.