This can be accomplished via the File Monitor feature. At a high-level, this is a control that would run frequently, typically every few minutes, and its input is a directory on your filesystem. Instead of capturing file data, it captures information around the files themselves based on inclusion/exclusion rules within the control. Generally the filenames are extracted and are sent to a second control to process the content of the file found. This allows for files with dynamic names to get captured without updating logic.
Within the Assure's in-product help (Help > Launch Full Help), there's more detailed instructions on using this feature under the "File Monitor Controls" and "Input Files Express" pages.