Yes. Try Mohit's tip.
I only have access to a Sony RX10 II camera and tried it on two macs (MBP and the Mac Pro "Trashcan", macOS Sierra and 10.11.6), I can not reproduce the issue. I attempted to import directly from the camera and a card reader. Lr 4/Lr 5/Lr 6 can successfully detect and import the videos from Sony Rx10 II. Apple’s Photos app show the videos as well.
Unless there is something special about the video capture for Sony RX10 III, so far I haven’t being able to reproduce the issue in Lr. Sony RX10 II indeed shoots AVCHD video. Does the video show up in Apple’s Photos app?
If you import directly from the camera by connecting it via a USB cable, rather than a card reader, you select the camera from the "Devices" section.
So thank you and Simon for your suggestions, alas they don't quite solve the issue ...
Attached is my screen shot, which was taken with the SD card (which Sony formats with the name "Untitled") inserted into the slot in the Macbook Pro. When I select the card, I see all of the images (jpg, raw) on the card (or new only if selected). But I do NOT see any of the movie clips.
If I select the volume "Untitled" in the Files area, then I have the option of selecting the DCIM folder, which is the usual place to store images. Then I see all of the images in all of the subfolders - but no clips. Sony apparently stores the clips in the folder: /VOLUMES/Untitled/Private/M4ROOT/CLIP. If I select that folder (or Private with Subfolders checked), then I see and can copy all of the images.
But there is no way of getting the clips when you select Devices "Untitled". I am so used to working this way with my other cameras, and I fear that I may again forget that I have taken some clips, and fail to transfer them because I didn't notice that they were not transferred along with hundreds of stills.
I have also inserted the card and run Apple's Photos app. The video clips do NOT show up in the list of files to be imported.
Thanks Jim for the confirmation.
I did some further investigation and can confirm the issue on my end. To reproduce the bug, I have to set the Sony RX10 III video format to shoot "XAVC S" video. Under this mode, the Sony camera will put the MP4 into the /Private/M4ROOT/CLIP. Unfortunately, neither Apple's Photos app nor Lightroom knows where to look for the XAVC S videos (under the "Devices" mode).
The issue will be fixed in a future Lightroom update. Thanks for your report.
Thank you for reproducing the problem, and putting it on the to do list for a future LR update.
I also summarize my interaction with Sony concerning this problem:
1) Use iMovie. (I have confirmed that iMovie does see these videos. But I want Lightroom to manage my mostly still image catalog.)
2) Copy manually. After connecting the camera via USB, find the directory and copy and paste the desired files.
I apologize for the inconvenience this has caused you. The path where the video clip is stored can't be change on the camera. However, customer input and response is invaluable in the continued support and development of our products. We want you to know that we appreciate you bringing this to our attention, and will forward your message to our support group for review. Should there be any update regarding this matter, it will be posted on the Sony US support website link below.
CarloC8DTSony Alpha Email Response Team
I am on 2015.9 on Mac and it does not recognize XAVC S from Sony a5100. They are also in /PRIVATE/M4ROOT/CLIP
I am importing from a SD card.
When I copy the files to a dir outside the SD card, it will import them.
Could you check whether the folder where the files are located isn't read/write protected or is a private folder?