I have 2 Roku 4661R devices, and I am wondering if via the USB port it will support devices formatted with the APFS File System. I have been using devices formatted with the HFS+ File System, but I am using the latest version of the Mac OS (Mojave), which uses the APFS File System.
Per the Roku support page: https://support.roku.com/article/208754908-how-to-use-roku-media-player-to-play-your-videos-music-an...
Roku Media Player supports drives that are formatted with the FAT16, FAT32, NTFS, EXT2, EXT3, and HFS+ file systems. You can also access different partitions on the USB drive.
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I also have 2 of those Roku Ultra devices, and also for my 2 Macs, run the latest version of Catalina, which requires the device/partition it is running on to be formatted as APFS. But other devices, partitions, etc, can be formatted as HFS+, EXFat, etc. Of course the preferable "other one" is HFS+.
I have 3 Samsung external SSDs. All 3 have 3 partitions. 2 of them have 2 partitions formatted as APFS for my SuperDuper! backups, and the third partition is formatted as HFS+, and it contains various files, folders, etc., including movies and TV series. The third SSD contains an APFS partition for (future) Big Sur testing, and 2 other partitions formatted as HFS+, one containing a lot of movies, and the other containing a lot of YV series. For any of those SSDs, via a USB connector plugged into either Roku Ultra, I can watch a movie or a TV series contained on those HFS+ partitions.
Another option for Macs would be to add the Paragon NFS driver that provides write access to NFS partitions. It is not free but a limited version is included with Seagate drives.