Here's a little info on my devices:
I've got a 2018 12.9in iPad pro, a 2018 Mac Mini 3.2Ghz 6 Core i7 with 32GB Ram and windows PC with an 8 core 3.6Ghz i9-9900K, 32gb ram and a RTX 2080.
I currently do a bunch of editing and shoot quite a bit of video on several different devices, including my iPhone 11, an DJI Osmo Action, DJI Osmo Pocket and a DJI Mavic Air 2.

I originally bought the mac mini because I needed somewhere to connect some external drives to archive footage, I like the OS and AirDrop makes it easy to transfer footage between apple devices. I also use this for general office work (95% of work done in web apps).

I bought the PC for gaming and VR, but didn't want to use it as a work computer.

I bought the iPad and LumaFusion and use it primiarly to do most of my 4k edits; however, the file management still isn't the best and doesn't always play well with Google Drive. I do love editing on the iPad though.

I also happen to have a subscription to premier pro, but don't really use it as workflow on the iPad seems faster and less complicated.

I think my mac mini may have an overheating issue as it seems to crash regularly if I don't manually run fans at max. I feel like the auto fan control doesn't work properly. It's all dusted out and I've considered applying thermal paste, but haven't gotten around to it. That said, I've been reevaluating what hardware I need.

I think it's safe to say that the PC is a much better machine and could do all the work I need it to... and even if I wanted to keep some of the apple apps like notes, reminders, etc..., that I enjoy the sync between iPad, iPhone and the Mac Mini, I could just use the iCloud web app. But... when it comes to video, it seems a lot of people have issues with exFat and getting footage from the PC to the iPad, vice versa might not be easy. This wouldn't matter if Google Drive worked better on iPad, as I upload all my footage there. Unfortuately, iPad doesn't handle team drives well and sometimes even if the iPad has tons of free space, it will not download files from Google Drive if they are too large.

Current Workflow:

On a typical flim day, I might shoot 4k footage on two cameras, the drone and my iPhone. I use iCloud or AirDrop to transfer all the files from my iPhone to the mac mini. I manually transfer all the files from the sd cards from my devices to the mac mini, then throw everything in labeled and dated folders.

Next, I send a copy to my external drives for archival storage, then upload the same files to Google Drive through file stream.

Once thats done, I attempt to import all my files needed from the days shoot which are now stored on Google Drive to the iPad. If Google Drive does not allow me to download all my files I need for the project (this happens regularly), I then transfer the needed files from the mac mini to a portable SSD, then transfer to the iPad.

I do my edit in LumaFusion, export then throw a copy in Google Drive and another copy gets stored on the mac mini on the archive drive.

If everything worked properly, I feel like this process would run way faster.

What's the solution?

That said, would you keep the mac mini and keep doing editing on the iPad (I wan't to keep the iPad regardless of if I do editing on it or not), or just sell it and use the PC for both editing in Premier and storage of video?

Any suggestions would be appreciated. I'd really like to save some time and streamline my process.