I have MC26 running on a laptop, with all music files on a NAS. Changing many old music files to High Def as I find them. Works like a charm even though a lot of the files are Hi-Def (24 bit) FLAC files of differing quality.
I have an LG V30 with an ESS DAC chip that can manage up to a 500Gig Micro SD card. I have a 256Gig SanDisk Micro SD card that I have inserted into my SD slot on the laptop. I use the handheld sync feature to move playlists and their associated music files from MC26 and the NAS to the SanDisk. Last night, tried to sync 100gig of High Def music files to the SD card, and JRiver shows the sync is happening and, it appears, completes fine. Took 4 hours. When I look on the SanDisk, the folder structure is in place, and the library shows the files, but the majority of folders are empty, or a coupla files show when 10's of songs have been synced to the folder.
Seems to work fine when I use a smaller 128gig card that I have used in the past. Card doesn't appear to be defective as other files write fine. Suggestions on what I should try?