A week back (mid-March), DO loaded correctly loaded Kindle internal storage subfolders and displayed thousands of items, albeit much slower than File Explorer. For example, Explorer this morning shows 1237 items after around thirty minutes of connecting via USB. DO 13.14 and 13.14.2 beta each gives me a message, "Filtering is not available in this folder." Scribe internal storage subfolder "documents" properties shows 1.30 GB used; 52.9 GB total in Explorer. Clicking on DO properties results in DO crash. I am submitting crash report. --John A. Kossey
If you're connecting it via USB / MTP, see: MTP and transferring files with Android and iOS phones, Cameras