JohnZeman

lol, go for it, I have the iPhone 13 Pro Max and love the camera on it.

Thanks for responding Walt.
The DNG raw files were created by the ProCamera app in my iPhone XR.
I've attached a zipped DNG from that app, I can open it and edit it but after saving as an afphoto file it crashes every time I try to re-edit the DNG in the Develop Persona.2020_0913_133755_148.zip2020_0913_133755_148.zip
2020_0913_133755_148.zip

For years I have had excellent results following the guidelines in the following tutorial about using the unsharp filter in Photoshop, the procedure is essentially the same for Affinity Photo.
https://www.photoshopessentials.com/photo-editing/how-to-sharpen-images-in-photoshop-with-unsharp-mask/

For years I have had excellent results following the guidelines in the following tutorial about using the unsharp filter in Photoshop, the procedure is essentially the same for Affinity Photo.
https://www.photoshopessentials.com/photo-editing/how-to-sharpen-images-in-photoshop-with-unsharp-mask/

For years I have had excellent results following the guidelines in the following tutorial about using the unsharp filter in Photoshop, the procedure is essentially the same for Affinity Photo.
https://www.photoshopessentials.com/photo-editing/how-to-sharpen-images-in-photoshop-with-unsharp-mask/

Another is the Save History with Document option only works with the .afphoto format, not the TIF format.

Another is the Save History with Document option only works with the .afphoto format, not the TIF format.

A few weeks ago I purchased the Nik 4 collection from DxO and the attached image shows how I had to configure Affinity Photo (for Windows) to use every Nik module.
Note the plug-ins folders I'm using are not the same as what you are showing.
Also I had to enable the "Allow unknown plug-ins to be used" option so the Nik modules in the bin folder would work.
Now all Nik modules work great from Affinity Photo.

I'm using Windows 10.

Thanks Walt.  When I open a 16 bit TIF in Affinity Photo, do some editing, adding layers and such, when I go to File > Save I am prompted.  But not to flatten the image, I'm prompted as to whether I want to save the TIF with layers or not.  I always choose yes and the tif is saved with layers.
And like you said if instead I go to File > Save as, then I can only save the tif as an afphoto file.  But I never do that with my current workflow so that's never been an issue.  If I need to do a file save as in that situation I'd do a file export as TIF command then give it any name I want.
I guess I'm still confused why the OP isn't able to do this.

I'm not the one who posted the original question but I'm confused by both Walt's and Old Bruce's answers.
When I open a 16 bit TIF in photo and edit it adding one ore more layers including adjustment layers, I have no problem saving my edits, layers and all, to the original tif with its original name.  Or I can SAVE AS to save it with all layers included but with a different file name.
I've been doing this ever since I started using Affinity Photo over 2 years ago and I've never had a problem.
Obviously I'm missing something because I don't see a problem doing what the OP wants to do or why it doesn't work for him the way it works for me.

I voted no. I use IMatch as my DAM and Capture One Pro as my main raw processor. I think it would take years to catch up to the power of IMatch as a DAM, and I'd rather they put the resources into Photo & Designer. I would like non-destructive raw processing in Photo, and I'd like to be able to copy and paste raw settings on a batch of photos, but neither would be top priority.
I once thought all in one management and processing was a great idea. I no longer think that way. LR is a rather weak DAM and it may be the best of the bunch in that regard compared to the other be all photo raw processors. Same goes for HDR and Pano. I wasn't even happy with the raw processing in the end which drove me looking for another does it all solution. I finally realized I already used a handful of specialized programs for HDR. I used PTGui Pro for panorama stitching with Affinity for finishing. So I changed my search to finding the strongest, most open DAM and a raw processor that was fast, had great color editing, and tethering. IMatch and C1 won out. Since I manage everything in a dedicated DAM, I don't hesitate to process a raw in Affinity,  or DPP if a certain image just isn't getting there in C1 (rare). Maybe I'll add DXO for it's reputed noise and geometry handling. Photo and Designer are great v1 programs, I look forward to them getting even better.