Be sure to use a thumb drive of the appropriate type and capacity. The basic Dynon monthly data update is pretty basic -- I believe that a suitable thumb drive is included with the Dynon Skyview unit. However, if you are using Seattle Avionics chart data you need a larger capacity, appropriately-sized thumb drive (see their literature for details). I use two thumb drives for my 5-year-old Skyview Classic and SA data.
David Heal - Windsor, CA (near Santa Rosa)
EAA #23982 (circa 1965) - EAA Technical Counselor and Flight Advisor; CFI - A&I
RV-12 E-LSA #120496 (SV w/ AP and ADS-B) - N124DH flying since March 2014 - 725+ hours (as of Jan 2019)!
through June 2019.