Dropbox Sync Won't Work – Foxit PDF Business & Converter Review

I just got the application, because I liked what I saw in the free version. But after buying the paid version, and trying to synchronize my Dropbox document library, the app started to work really slow, and syncing won't work. What's worse, my second generation 12.9" 512GB iPad Pro will come to a crawl every time I open this app. It is totally useless for me!
Review by carlossierra on Foxit PDF Business & Converter.