I run two systems on a Mac Pro Desktop with 32 gigs of ram. One system is running OSX High Sierra 10.13.6, the other is running OSX Mojave 10.14.6. Both are running the most current version of Photoshop CC 2020 and its version of ACR. Within 10.13.6 I can merge 3,4, 5 or 6 raw files to a single DNG without any problem. Within 10.14.6, when trying to merge the same files I get, "Merged result exceeds maximum size." In both cases the preference option is set to 21mp at 16 bit per individual raw file. I have run through the ACR preferences and can find no setting that changes the outcome in 10.14.6. I have no problem running the automated merge in Photoshop CC 2020, but I want the DNG from ACR first for possible future readjustment, and then I can dump the raw files and recover a lot of storage space. What am I missing here?
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