Starting with the release of Strategy ONE (March 2024), dossiers are also known as dashboards.
In Strategy Library 10.11 for iOS, when a graph visualization (such as Bubble Chart visualization) is used in a visualization filter, the tooltip in the graph visualization is not be shown in the filter. View the image below to note the missing tooltip:

Note: The tooltip for the visualization filter shows up in Library for Web, as well as in Library for Android.

This is a known issue in Strategy Library 10.11 for iOS.
Our engineers are currently working to enhance the Strategy experience.
Currently this issue is still being reviewed for feasibility by our Technology team; it is not currently scheduled.
Still having troubles? Feel free to start a discussion on Community or create a case with your Support liaison.
Interested in learning more about Dossier authoring or mobile? Check out the Learning Center on Community!