PB_H - you click onto where it says phone, within phone storage, then that takes you to a breakdown, and then you click through each of the other subheadings
i have the same problem on the HTC 8X too, i'm sure it'll be fixed with the official release.
I'm not surprised with the discrepancy between MS and Nokia in regards to the temp file size. Most likely MS bundled everything together againlol. Have you guys tried deleting the ie history via ie as well? I don't have update 3 installed to check, I found that the Nokia's storage app currently does not delete ie history looks like the ie cache is locked - as you can see below: Nokia storage app does not clean ie temp files (L920 with Amber).
Edit: Tried clearing off the 29 mb but it doesnot go, not a big deal but the lowest I have had it is 5mb.
Read somewhere that if you change the year to 2014 and then run the GDR3 delete temp files option it does clear the data. I tried it on my 920 and then my 925, both times it worked. Make sure you change the date back to current date.
Try this
Goto Settings > Time+ Date and then change the year to 2014 or further and save it, now goto Storage Check and try to clear temporary files.
i hope that helps. Don't forget to change your date back to current.
I've got a Nokia 1520. I had 7.5g sitting in temporary that I couldn't get rid of - until I changed the phone date to 2015 (someone in this thread suggested it). Worked perfect. I don't know for 100% certain that changing the date actually made it work - but it's finally deleted.