3 external HDD on network, only one computer shows ALL three HDD. The other three computers do not show the external HDD

My computer is a mac mini running Catalina 15.5 with three external HDD all USB

The other three computers a Macbook Pro ... running Sierra .. Macbook pro running Catalina 15.5 and the third Macbook pro ... Sierra

My mac mini is connected to a LaCie 3T, for back up and two WD 10T for media storage and back up

File sharing has been set up ... with permissions for those that are working on the network

LaCie is USB 3 the WD are connected by USB-C to the mac mini

All show up on the mac mini ... under devices/location, how ever when one logs in on any of the other three computers NONE of the three HDD show up. Have tried disk Utility still no joy

Prior to updating to Catilina on my mac mini, all were able to access the HDD as they were available for selection

To watch movies stored on the WD10T in .mp4 files requires the volume be accessible to each computer

Think it had to do with changes associated with modification of running a external boot drive, which I had done for years ... was using SSD to increase faster access and transfer

Thanks for any help ... Stumped