Texture Images in UV editing and in Properties panel : do they 'overlap' ?

Support Materials and Textures
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Texture Images in UV editing and in Properties panel : do they 'overlap '?
Hi all,
I have a hard time to understand texture image relationship in Blender between UV editing and Texture Property panel. Especially, when exporting to COLLADA.
To go straight to the point, my question is : do I need ‘Image1.jpg’ in both UV editing panel and Texture Property panel to get both correct Rendering and Export to COLLADA ???

Some details:

  1. I have UV edited ‘Image1.jpg’ onto an object. When rendering or choosing ‘Texture’ as Viewport Shading, I do not see the texture on the object. Is this expected ??
    But export to COLLADA is fine with the expected separated Imga1.jpg file.

  2. In the Texture tab (Proprety panel), if I open ‘Image1.jpg’ (in addition to UV editing) then I see the texture when rendering and export in COLLADA is fine too.

2

Use the UV/Image Editor window to edit your UVs and Images
Use the Texture panel in the properties panel to add textures to materials