Animated GIF Overlay

[lrbrister]

I have created an animated logo gif in Photoshop
The logo fades in over the course of 1.5 seconds
Stays for 30 seconds
Fades out over 1.5 seconds
At full fade in it is at 50% opacity

How should I export for use in OBS as a source layer?

I am using GIF 128 dithered preset.
Should it be something else to get the full opacity and effect?

 

[FerretBomb]

GIF as a file format does not support gradient transparency. Each pixel is either fully transparent, or fully opaque only.
The individual frames may have transparency in Photoshop, but as soon as it's actually baked into a GIF, that gradient will not carry across.

As cyclemat said, you can export it as a .webm video if your copy of Photoshop supports it; this is the de-facto standard at present.
You may also be able to export it as an .apng, which does support full alpha channel gradient transparency, but is not an accepted standard. I believe OBS Studio does support APNG playback, but is limited in file-size (uncompressed full frames filesize, that is).