I’ve seen at least 8 flash drives added using a bridge but when I attached a 4bay usb 3 bridge with three Four TB drives and one two TB drive only one of the four TB drives is seen. All seen on PC’s running windows 7/8.1/10. Would like to use it as media server and the internal EX drives for backup and extra storage.
You may want to ask your question in the dedicated EX4100 subforum if you have an EX4100. There may be more knowledgable people who are familiar with the EX4100 in that suboforum. This subforum (My Cloud) typically deals with the single bay My Cloud units.
Thank you will try that