Nested data driven tests generates quite large results, even when there is no data in the bound data table (built-in or external). The result is almost twice the size of the same tests, if these are not using the data tables. The tests may be using InheritParentDataSource, but the behavior is similar if these are not using it as well.
For real user scenarios, the large results may exceed the limitation of the file size (16MB), which can be transferred through the storage service.
Investigate if it is possible to optimize the data driven test results, at least for the case, when the data source is empty.