What are the most common technical issues users encounter?

The most common performance issues are caused by (1) a very slow Wi-Fi connection; (2) using extremely large documents; or (3) a combination of both. For the best experience, you should make sure that the Wi-Fi or other internet connection you use is adequate (look for a minimum speed in the range of 5Mbs upload and 5Mbs download). And make sure that the documents you use are not unnecessarily large due to the way they were scanned or otherwise converted to .pdf format.