Usually FB and FBM depixelates the files to reduce the size.
If you want to retain the quality send it via viber or telegram. But expect bigger files. 😊
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As for your concern and as per the comment of your fellow member here, file size and quality may be altered when sent using other apps so as to reduce upload/send time. You may opt to send original files via email, Viber, and/or upload it to Google Drive and share the link with your peeps.
Oh, and Bluetooth is still available should you choose to send it to your friends' device if you're with them. 😉
Hope to have helped you too! Keep safe and enjoy the weekend. 😊