Note: On your phone, PDF documents may only open if you choose the “Save, Replace, or Keep Both” option and then it will be downloaded and notify you of this on the top of your screen. Open it there or in your Downloads folder and it will give you the option to Open with Adobe Acrobat, Drive, or some other PDF app you have installed on your phone. If you watch the associated video, it will open in another tab/window so that you can easily bounce back & forth between the PDF doc and the video. If your screen is big enough you can even arrange the windows next to each other!
Note: The Diddles category is really about about alternating Single-Strokes R L . . . with Double-Strokes R r L l . . . that have been “expanded/relaxed/loosened” into a more “opened-texture” like R L L or R L R R L L. However, if the Double-Strokes are kept “compressed/contracted” into a more “closed-texture” like R r L l, R r L l R, or R r L l R L, the emphasis is still on the alternating “rolling” of the Double-Strokes, which causes it to then be found on the Double-Strokes page. Now if the Singles and/or Doubles become so “compressed/contracted” that they become grace-notes as unspecified Note/Time-values connected as a Setup to a Principle-Stroke like rlR 3-Stroke Ruff, rlrL 4-Stroke Ruff, or llR Rudimental Drag, then these will all be found on the Drags & Ruffs page. The level of complexity and uniqueness of sound has caused others in history to classify them differently, but you really should view them as all related on a spectrum of open-to-closed texture.