How do I use a Neewer NW-625 flash with an A7ii

[Photo7iiFun]

I have an A7ii which is working great - until I try using flash.

I bought a Neewer NW-625 flash - which according to the vendor is marketed as fully compatible with the A7ii "Mi Hot Shoe".

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I have tried some indoor photgraphy in low lighting, with the camera set on Auto (keep it simple start!).

Without flash, the camera is fine, but long exposure times of 1/10s to 1/50s are being computed - so a fill-in flash would help.

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But when I enable "fill flash" (auto flash can't be selected when camera is on Auto), every picture I take is a white-out.

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So two questions:

1) Is the Neewer NW-625 flash really compatible with the Sony A7ii ?

2) If it is, then how do I use it ?

    Is there a "how to" type user guide ?  (I have looked, but cannot find one in the Sony site)

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There is a brief one-page guide from Neewer, but that really does little more than identify controls and the screen content of the flash - and does not explain what terms/numbers mean or how to use the flash.

The Sony guide simply says to attach the flash and "press the shutter button fully down".  Not exactly a guide.....

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Many thanks in advance to anyone who can point me in the right direction.

[HannahEd01]

Hey Photo7iiFun, try removing the batteries for two minutes.