RB7 - Uploading tracks to Dropbox

Thanks for Rekordbox 7! I hope you fix the main errors soon. I have some too.
After connecting the PRO package, I started uploading the library to Dropbox. The upload speed is on average 20 mbps, I am connected to a high-speed Internet of 1 gigabit per upload. At this speed, 1 TB of music will take me 15-20 hours to uploading. This is about 4-5 times slower than my available speed.

1. Is there a speed limit for uploading tracks to Dropbox? If Yes, then why?

2. Why does uploading tracks to Dropbox start after reaching 20% ​​uploading status?

3. Why is Rekordbox not available for use when uploading tracks to Dropbox?

4. Sometimes when uploading a track to Dropbox, an upload error pops up and you have to upload it again, and after that a copy of the track with the ending (2) in the name appears in Dropbox in the folder with the track. How can I clean up duplicates in Dropbox later? Should Rekordbox analyze and delete clones of files in Dropbox?

5. Why are all tracks, after saving to Dropbox, renamed on Dropbox itself and even with the name cut off? For example: It was - "Wata Igarashi - Floating Against Time (Original Mix)" It became "wata igarashi - floating against time (orig"