Final answer:
Too many metrics, too many dimensions, a filter that removes all data, and custom report not being shared can prevent data from appearing in a custom report.
Step-by-step explanation:
The factors that could prevent data from appearing in a custom report are:
- Too many metrics: If a custom report includes too many metrics, it may exceed the limits of what can be displayed or processed, resulting in missing data.
- Too many dimensions: Similarly, if a custom report includes too many dimensions, it can make the report too large or complex, leading to missing data.
- A filter that removes all data: If a filter is applied to a custom report that filters out all the available data, then no data will appear in the report.
- Custom report not being shared: If a custom report is not shared with the users who are supposed to have access to it, they will not be able to see any data in the report.