Trimble DL App & Logging Static
Well that's stupid recording to the app (and hence needing to leave your phone at the unit).
Today I tested the app with the R6 and it let me do everything except record. It kept saying "PDOP Unavailable" which I think is Trimble secret code for "your firmware is too old".
I then tried using Survey Pro to start & stop a static session and it worked perfectly. It didn't interrupt my RTK session with the other unit was pretty logical with the workflow. I had installed Fast Survey (Carlson SurCE in disguise) as a demo, but it doesn't have any Trimble units in its listing.
I used Trimble DL to perform static for almost 2 years. It never 'stored to the app'.
You can easily configure the R6 to start logging when powered up regardless of the firmware version.