NOT syncing but NOT over limit/quota

Question

Hi. I have a strange issue. Some time ago my Dropbox stopped syncing my files despite the fact that I haven't surpassed the storage limit (and there is no notification/indication of the storage being "full"). On the contrary, at my account I see a notification Upgrade soon to get more space proves that I have some unused space). Here are some numbers:

Regular files (3.9 GB), Shared files (876.8 MB), Unused space (546.4 MB)

Backup (0 bytes)

1) What can I do to solve this and restart the synchronization, please?

2.1) Am I currently at a potential risk that I have been unknowingly editing some files autonomously making "conflicting" versions on each of my devices?

2.2) In that case, which version will be preserved after restarting the synchronization process? The newest (I guess)?

Thank you kindly!

sazenicka · Accepted Answer

Problem solved! My boyfriend showed me that the Dropbox programme (on my laptop) needs to be opened and thus refreshed in order to start synchronizing. So we did that and I changed its settings to "Start Dropbox on system startup" (in Preferences).
But thank you for your time, anyway.