Hard disk issues in Android

I have Samsung SSD hard disk. I copy files from my Android device to hardDisk. Multiple times I disconnected hardDisk and connected hardDisk to phone and it worked fine. After a day when I connected the hard disk to Android phone then I get error that I need to format the hardDisk to be able to use it. When I connect the same hardDisk to Windows Laptop or MACbook then it still works fine. In MAC I ran the FirstAid in Disk utility app and even that says the hardDisk is fine. The hardDisk is formatted as exFAT. How do I find a permanent solution or a workaround? I want to be able to copy copying files from phone to hardDisk directly instead of copying files from phone -> computer -> hardDisk. I tried with Seagate HDD and faced the same problem.