Force instant synchronization of a single file or folder

I’m storing a large amount of data (61GB; a few hundred thousand files) on an Owncloud server. Occasionally, I have the issue that I need a file to work with but the client is still busy syncing, because the PC I am working at has not been used for some days. I see that it is perfectly normal that the syncing takes some time, because there are so many files. However, it would be great, if I could trigger an instant synchronization of just the file or folder that I need at that point of time. Like that, I could start working right away and Owncloud could happily sync the other files in the background.

Is there a solution for this problem?