Here i have several planes with png cloud textures. I have to export and put in an app as a glb. I have disabled the shadows in object, material and render properties but the shadow still appears on the app. (Cannot disclose the app). But there is lighting inbuit in the app.
I did ask claude to do it so this is the unlit material it did which still produces a shadow. So in the end it said we can’t do anything in blender.
Is there anything i can do so that the shadows do not come in the app?
Welcome 
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..changing any settings in one of blenders render engines will not influence any settings in any other renderer engine.
So you have to check the documentation of whatever engine you use.
(You can not even use a too complex shader setup, because glb can not “store” everything what blender can. But then some the other render engine might be able to do more than glb stores in it’s format.)
Indeed, a shadow is an absence of light. So, some planes, that are more distant to source light, will obviously show fall off of intensity of light.
A shadeless material is often simply an emissive material, that emits its own light, using an Emission shader.
We can often skip Emission shader, by directly plugging texture node to output, to obtain a shadeless result.
Documentation has a paragraph on GLTF export page about how creating a shadeless material.
Use of Light Path node and Mix node, allows to keep texture visible to Camera ; while Transparent shader assures, it has no effect on rest of the scene.
