Resource Manager allows you to share images, snippets, master pages, topics and multimedia files such as SWF with other authors and other projects, even if they are stored in cloud-based locations such as Dropbox, One Drive and Google Drive.
You can make the Resource Manager pod work in various ways:
You can define a single common location where all resources would be shared.
You can define multiple locations for your resources.
You can define different locations for storing each resource type.
The locations can include the popular
cloud storage services, SharePoint
sites as well as network shares.
In the example below, both Dropbox
and Google Drive have been
added as Shared Locations.

RoboHelp establishes a link between any resources in the project and the Resource Manager and scans both the Project and Resource Manager locations periodically to see if anything has changed. If an asset is changed in some way, RoboHelp notifies you of the change.
Shown below is the path of a drag of a topic from the Project Manager to the Resource Manager. Note that the color turns green as the link is made. There is also a visual preview of the graphic which happens to be included in the topic.

When the author makes a change in the topic and saves, the icons and topic title turn red to indicate they are out of sync.

You are able to easily update shared resources in the project by selecting them and clicking Sync. Additionally, you are able to control the frequency for comparing any linked resources and comparing what is shown in the Resource Manager with the location it points to.

Resource Manager is specific to each installation of Adobe RoboHelp. To see this in actual use you will need to configure the Resource Manager to point to one or more folders where common content is located. Then use an asset presented inside the Resource Manager pod by dragging from the pod to the project.
Click the Add Shared Location icon in the Resource Manager toolbar.
Navigate to the location and click OK.
Type a name to represent the location in the Resource Manager pod and click OK.
Locate the resource in the Resource Manager pod.
Click and drag the resource from the pod to the topic where you want it to appear.
Go to dropbox.com and authorize sharing with your co-authors.