Internal Sd/ External SD card

Hi,
Got TWRP manager on phone.
On Install Manager page there is; Device Name (GTi9300)-----Recovery Installed-Custom recovery not installed or detected,
Recovery version to install-twrp 2.8.6.1 i9300.img---
I don't want an .img file, do I--should it not be a .tar file surely. When I have tapped install .img recovery, all I got was pages of gobbledegook
When I look for correct phone, twrp keeps throwing an img file at me. Perhaps it's Windows 10 having a laugh at me, lol.
I used TWRP because it seemed easy last time- perhaps Philz or CWM would be better- never used either before.
I rooted the phone with Kingo root- first time success, again.

If it wasn't so late, I would jack this in and go to the pub, lol.

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Internal Sd/ External SD card

Internal Sd/ External SD card

I have an S3 (Gti9300) rooted and with TWRP recovery installed, with nandroid backup done.
When I go into recovery, select TWRP , it only shows what is on the internal memory. My new rom and GAPPS is on the EXT SD card, and won't show.
Am I right in thinking that if I wipe data/factory reset, wipe cache partition, and dalvik cache, it will wipe whatever is in internal memory and no rom or anything else will be available to flash.??
So how can I see the EXT SD card in twrp.??
The ext sd card has been wiped, coming from my NOTE 4.
Or has the ext card got to be mounted? I can see ext sd in the MOUNT button in TWRP screen.
I rooted my original S£ and can't remember having this trouble. (Omnirom V5 KK4.4.4)
I want to get advice before carrying on and naffing it all up.
Thanks

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Internal Sd/ External SD card