What is a common issue when exporting reports to file types like PDF or PowerPoint?

The correct answer highlights a frequent limitation when exporting Power BI reports to formats like PDF or PowerPoint. Many custom visuals created for Power BI might not be fully supported when transitioning to these file types. Microsoft offers a variety of built-in visuals that have better compatibility during export, but custom visuals can have various dependencies and dynamic elements that do not translate well outside the Power BI environment. This can lead to situations where critical visual information is lost, which can compromise the overall insight provided by the report.

The other options do not accurately represent common issues faced during the export process. Generating duplicate files is not a standard outcome of exporting a report; rather, users typically create one file per export instance. While the exporting process might take some time depending on the complexity of the report, it is not inherently considered an unexpected delay issue. Finally, the statement that only text data is exported while visuals are removed misrepresents the process. Both visuals and text should generally be preserved, though, again, custom visuals might not export correctly.