For example:
I have a workflow with :
Activity1
Activity2
Activity3
And the workflow was suspended on Activity2. I want to resume the workflow from Activity2 and depends on the circumstances.

Lets say I am downloading file from ftp location using download activity during downloading some one stoped the workflow service, that time system is not throwing any error but status still says that Running and this status will be for ever. But it will fail to do intended activity which is file download when we restart the services.