Some actions have parameters where you need to specify a document or a folder. There are several ways how to do this.
The picker will display files or folders under a Work Area of selected connection. Picker stores the selected a path as a string.
An object of interest may not yet exist so it will not be possible to use a picker. For example, you need to create a document in a folder that was created in previous flow step. Create Folder action returns folder GUID of created folder. This GUID can be used to specify folder for a new document.
Path is a string value so it can be created using flow expressions or entered manually. Fodler path consists of folder names, document path consists of folder names and document name (not file name!).
To specify relative to work area begin path with './':
To specify relative to datasrouce root begin path with '/':