Amazon added a Storage Management feature to Kindles quite awhile ago, and it still seems like one of the lesser-known features that most people don’t know about.
If the private file you want rid of is located on an SD memory card, rather than in your phone’s internal storage, there are a couple of ways to delete it. First, go to Settings Storage SD card. Locate the file and delete it from there. However, this won’t make it unrecoverable, so you may want to format the card, too. I don't think the Mavic Air would have an 'format internal storage' option in the DJI APP if it would break the internal storage. With that said, I'd rather have the Mavic Air reformat its own internal storage, instead of letting Windows do it from the file explorer. Of course you can go in and delete your photos and videos and/or move them to your PC (and you should), but the fact is there is really no need to have your small internal storage deal with all these media files while your external SD card has a ton of free space sitting idle, especially if your internal storage already has a lot on it’s plate.
If it gets to the point where you’re Kindle is starting to run low on storage space, there are a couple of ways to free up additional storage space.
You can long-press on book covers from the library view and manually chose to remove books from your device one-by-one.
That works fine if you only need to remove a few books, but if you want to clear up additional space for future downloads, the fastest and easiest way is to use the Storage Management feature.
It can be found by opening the main settings menu on your Kindle and then choosing Device Options > Advanced Options > Storage Management.
From there you have a few different ways to free up storage space. There’s a Manual Removal option where you can choose from different types of content (books, audiobooks, documents, etc) and then choose multiple titles to remove at once.
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Another option is to use the Quick Archive setting. This will remove content from your Kindle that hasn’t been opened from preset intervals of 1 month to 1 year. It shows how much extra space will be available with each selection so you know how much space it will free up.
Clear Internal Storage Space
I’m not sure if the Storage Management option is available on older Kindles or not, but it is available on all the current and previous models dating back to the Kindle Paperwhite 2.