I took a video of approximately 40 minutes long this morning at a funeral. I stopped taking the video and waited for it to "process". It took very long, so I switched my phone off. But now I can't find it anywhere on my A32 Samsung. It is not in the recycling or trash bins. I also can't find it on Google photo's. Is there any way that I might be able to retrieve it? I was the only one that took a video, so it is very important to the family.
One option is to take your phone to a professional data recovery center, and they will try to recover the video for you.
For example, if you google "Phone Data Recovery", you can see lots of services available. You can add your local city to google search "Phone Data Recovery in My City (such as Seattle, Miami, Toronto,...)" and it may recommend some local services in your city if there is any available.
Another option is to google "Android Phone Data Recovery Software" to see if there is any recovery software either free or paid, which could be used to recover the video. However, since you have not installed the software before your record the video, the potentially BIG issue is that if you install a recovery software now after you already lose the video, the new software may be installed over your lost video and you will lose that video. So, I will not recommend this option for your current situation.
Since you switched off the phone while the video was being saved, the video may not be properly created on your phone yet, and that makes it even more difficult to recover than the case where you accidentally delete a good and working video. However, I still hope that the professional service centers can help. Good luck.