To get Facebook to recognize it, you'll have to re-attach the exif info that is missing (not sure why DJI can't just keep the exif data attached to the image?). There are super convoluted ways of using websites or programs to add in the info needed to the photos exif data.
OR, the easiest way I found was to use the Google Street View app on your phone. Essentially you import the photo to Street View app, save it back to your phone from the Street View app (which fixes the exif data), then upload to Facebook:
-In the Street View app, hit the + icon in the bottom right, and add your flat 360 photo that you got from the DJI app, that's saved on your phones camera roll. This will turn it into an interactive 360.
-Then hit the share button and "Share Privately", which allows you to then save it to your phone.
-Now upload that image saved from the Street View app to Facebook and it should work.
(You can always Publish them to the public, and they'll show up on street view and google earth which could be really cool for the world to see!)
As far as using the raw images, or individual images to stitch them on your mac... It definitely results in a much higher resolution image, but also involves a convoluted process of finding software to download to Mac that will do it for you. Seems there are great free ways to do it for PC, but limited on Mac. I didn't find many great options that were free that wouldn't leave a massive watermark on the image. I tried the trial version of the PTgui program which was great, but to remove the obnoxious watermarks it costs $157, which is silly. There are also tons of guides showing how to use Photoshop and Lightroom, but again I'm not willing to get caught up in a monthly subscription to those at the moment, and just resorted to using the lower res image from the DJI app. In all honestly, all my friends and family on Facebook will never notice any difference in a low res version and the high res version. I even asked a few people if they noticed much difference and they didn't. It seems I'm the only one that it's going to annoy, and the content of the image is way more important anyways. An aerial 360 is going to blow most friends/family away regardless of the resolution.
I hope others with more experience will care to share.
Good luck, let me know if you have any trouble or further questions. Post up your 360 here if you care to, would love to see it!