Dropbox allows you to recover any deleted file up to 30 days old. To access this feature, launch the Dropbox website, then go to the folder where you want to recover the file. To view deleted files, just click on the trash icon at the top, which will toggle the “Show deleted files” option.
The deleted files are grey & listed in the “kind” column as a “deleted document”. By right clicking on the file you have the option to “Restore” or view “Previous Versions”. “Previous versions” will list the version history & allow you to restore the appropriate edition of the file.