Cool. Shame my problem seems to be that as long as I want the SD card to appear in Android I need to format the SD card FAT32 instead of exFAT. 4gb file size limitations with FAT32.
If it was 32gb, that is an SDHC card which is formatted FAT32. If it was a 64gb or larger it is SDXC and formatted either exFAT or NTFS. Though NTFS isn’t generally what the card are formatted to until someone gets hold of them…