AntimonyER
CHANGED FROM AF ADDICT MIKESTONY
Good Morning! I merged a few threads regarding the same topic. Thanks for understanding. 

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Im on o2 uk.
android file transfer worked perfectly before the update, now it doesnt recognise when my phone is connected at all
Yes I'm on a mac too. switching between the usb modes doesn't change anything at all.
I can't use kies either because I'm on OSX 10.8 and there isn't a client available.
Surely samsung can't have intended this to happen and it must be an overlooked mistake.
I don't want a work around, I want it to work like it should.
It's looking like the only option may be to return my device to factory settings.
Well im on a PC and im having MTP drivers issues so i tried doing a factory resest twice with no luck. I think apple and windows are secretly trying to sabotage the S3 by limiting its ability to connect with their computers. Or it could also be a partially broken interface on the S3.
I just plug mine in via the supplied usb. I've got an international s3. Pops up as two drives, internal and external sd cards. Works via MTP profile.
Have you installed the samsung drivers?
hello,
I have a Galaxy S3, and everything works just fine, when I plug in the USB on the phone and PC. A window will pop up an I can use a File Manager to browse the directories on SDCARD.
But only SDCARD is shown. Is there an option somewhere to switch to the other mounted (internal) devices?