Ok, found it. Has some odd inconsistent features like Dale's Avatar scanner that obviously can't work properly in this form and a phantom and forced sit feature. Not sure what it is for. Some other weird stuff in the preferences. Looks like someone has thrown some patches on a viewer without really understanding how they work and what they are for. Or perhaps it's just me

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However I could not find what "temporary upload texture" is. Something from the SL plugins eventually?
If you don't want to spend the 10L for an upload I suggest to work on your textures and creations in the beta grid. And only upload the final version to the main grid when you think it is ready. Messing around with the protocol may not only cause technical issues when communicating with a simulator, it may also result in getting you banned for your activities that are not governed by LL's protocols.