@cwight Most probably you cannot use the autopliot commands to open the dropdown menu, please check this post for more details.
Did you give my snippet a try? You can activate the dropdown first, rather than opening it, using a sequence of the {key: tab} commands (like clicking on some input in your page with the {click} command, then pressing as many tabs as it needs to activate your dropdown menu, using a sequence of the {key: tab} command). Ater that, use the code of the snippet I shared to type the brand name, I hope this selects your brand. Even if typing slowly manually will refresh the page, please give it a try with the autopilot, it will type it quickly without getting the page to refresh. Here's an example:
{brand="Your brand name"}
{wait: delay=+1s}
{click: frame=top; selector=#your-input-selector; maxdelay=+1s}{key: tab}{wait: delay=+1s}
{repeat: for x in split(brand, "")}{key: {=x}}{endrepeat}
If the page just refreshed on the first key press, then I'm afraid there can be no way to automate this selection. Please let me know if the snippet I shared did the trick for you, or if you need any further assistance applying that approach.