Is there a Way Or An App to Comment on a PDF So That Changes in One?

Is there a way or an app to comment on a PDF (highlight, underline) so that changes in one device are saved online and are available on both devices so that you don't have to transfer the file from one device to the other and continue on the go?

Like Sunshine, Send Anywhere has also moved on from the cloud-based model. The main difference between the two apps is that while Sunshine requires you to create an account before you can use it, Send Anywhere only uses SSL security and a 6-digit key to pair two devices together. This has both advantages and disadvantages. Although it speeds up the process at which files can be sent and adds a layer of anonymity to the process, it also means no more than two devices can be paired together at any one time, and you’ll have to disconnect from one paired device to connect to another. As with Sunshine, there are releases for multiple devices — but if you want to enjoy the ability to remotely manage every device that you’ve registered with Send Anywhere, you’ll still have to create an account and log in. Other useful features include the ability to pair devices together by using a QR code (similar to how the WhatsApp web app works), and a way to share files by Bluetooth to avoid all forms of networking if the two devices are in close enough proximity. Shared files are only available for ten minutes by default, but that can be changed in the settings.