Either way, you can solve these issues almost every time by clearing Dropbox’s hidden cache folder.This folder holds gigabytes of miscellaneous data collected during file downloads and sync processes in a series of smaller files with crazy alphanumeric names.
It is possible that your files have synced correctly to the cloud, but Dropbox is unable to read them correctly.
As the replacement was rendered, the file in the host’s Dropbox folder seemed fine, but the rest of us were caught in an infinite sync cycle in which nothing was actually being downloaded.
This problem was caused by a conflict in Dropbox’s cache.
In this case, restarting Dropbox by closing the program completely and starting it again can re-sync your files and display them properly.
If a file cannot upload, restarting Dropbox can also help reset the upload.