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I would suggest that you reset the phone to factory defaults to see if this resolves the issue.
Touch the icon that has 4 dots then touch the icon that looks like a cog wheel. Under 'Phone Settings' find and touch 'Reset Settings'.
This may resolve the issue. If not remove the battery for one minute then reinsert. If the problem persists after this there is a problem with the internal microphone that will require service attention.
Bluetooth seems to work for both up and downloading. For uploading make sure the two devices recognise each other. Then select the file in the appropriate KU990 folder. Click in the little text box on the bottom left. Select Send then choose bluetooth and your target, which should be your bluetooth equipped mac.
To download to the KU990 from Mac select send file in the blue tooth icon menu and proceed logically.