Application of the visa application for visit to the United Kingdom of the AU

I am a Bangladeshi citizen. I came to Australia on a visit visa (600) in August.I want to know if I can apply for VISA VISIT TO THE UNITED KINGDOM FROM AUSTRALIA.

The problem is that I do not have any documents with me now, because I live in Bangladesh. I may not be able to submit bank statements. In this case, is it possible for my sister in Australia to sponsor my sponsor (my friend from the UK) (to support my UK fees). What is the probability of getting a visa this way?