Currently, when selecting data sets in the merging and stacking widgets, users must type the entire name of the data set in Data > Data Sets (see steps 2 and 3 in this help article, for example: https://help.displayr.com/hc/en-us/articles/4405211157391-How-to-Merge-Files-by-Case-Add-New-Cases).
This feature request suggests an easier mechanism (eg: a searchable dropdown menu) for users to easily select valid files from the Cloud Drive to input into the widget).