I have developed UiPath (CE) solution in AWS EC2 instance and thereafter deployed the package and scheduled the process in Orchestrator (configure to run as an unattended bot).
UiPath process steps:
a) Opens a site in new browser
b) Log into the site with username and password
c) Perform some action in the site
If I am logged into AWS EC2 instance, process works fine on scheduled time.
But, if I have disconnected the RDP session, process is initiated, but bot is not able to type username in site page (Step #b).