you can try to backup the files and then format the drive on Exfat to have a bigger limit in that case and copy more files inside the drive and the software
Did you format the drive before using it? Drives larger than 32GB are manufactured with a format of exFAT and do not need to be reformated to handle large files.
If you didn’t format the drive I suggest you follow the advice to backup up your files but then return it to where you bought it for a new drive.