Is the storage location set to SD card?
Because of the SD card's own settings, you cannot be download files larger than 4 GB at a time into SD card. Please make sure that your storage location is saved as an SD card in the settings in our app.
If you want to download files larger than 4GB, please change the storage location to internal storage or please transfer after dividing files smaller than 4GB. Then you will be able to download them.