In the current OD4B specification, when updating the file in the folder to be synchronized, the updated file, not the difference, is fully synchronized, which leads to the tightness of the communication of the end user's NW by the communication of OD4B.
In our recognition, only Word, Excel, PowerPoint files supports differential sync, if OD4B deal with files that created other applications as well, it will be very helpful.
Geoff Faulkner commented
Already suggested, with over 6000 votes. https://onedrive.uservoice.com/forums/262982-onedrive/suggestions/6369855-enable-differential-sync-only-sync-parts-of-the-f?page=7&per_page=20