This has been my approach to presentations. If it was originally a google slides document, I download it locally before the presentation time, and even for local .pptx/.odp files I always make sure to export an extra copy in PDF format, just in case.
Sometimes, for especially important talks, I even bring two laptops pre-provisioned with the slides just in case one has technical issues for some reason or another.
Its not that much extra work, and should the preparations pay off even once makes every bit of the toil well worth it. Nothing worse than embarrassing yourself in a room full of your colleagues, even moreso if the talk will be recorded and posted online for others to witness in perpetuity.
At one time, I had some accessories so that I could present from my phone if needed. I think I may even have used it once. But, yes, be prepared both in terms of gear and mentally for glitches. E.g. if your clicker isn't working be ready to smoothly transition to telling the AV team next slide or walking up to your laptop as appropriate.
Sometimes, for especially important talks, I even bring two laptops pre-provisioned with the slides just in case one has technical issues for some reason or another.
Its not that much extra work, and should the preparations pay off even once makes every bit of the toil well worth it. Nothing worse than embarrassing yourself in a room full of your colleagues, even moreso if the talk will be recorded and posted online for others to witness in perpetuity.