There's a strong argument that the floating eye on the dollar, the Eye of Providence above a pyramid, comes from Freemasonry. (There's also an argument that it was meant as a Christian symbol; the only thing we know for certain is that it has nothing to do with the Bavarian Illuminati.) Vox
Other sources: a random conspiracy site; a second random conspiracy site. Quora.
None of those sources look particularly credible to me; I didn't spot citations or research, just assertions. At least to me the answer to your question "Was the Eye of Providence a symbol of the Bavarian Illuminati?" Is "no, there is no evidence to support that". I choose not to closely examine the assertions they make - for example the link between the Eye of Providence and the Eye of Re, because that isn't germane to your question, and because I don't place a great deal of credibility in the sites mentioned.
I'm choosing to interpret this question as a request for information about historical imagery, and not as a question about conspiracy theories - because those are explicitly out of scope for this site.