nFF

Can't you just copy the Presets file to...
Back it up.  Transfer it to another computer.  
The location of the presets etc is:
Windows:  Affinity Photo (APh): C:\Users\{your username}\AppData\Roaming\Affinity\Photo\1.0\user\export_config.dat Affinity Designer (ADe): C:\Users\{your username}\AppData\Roaming\Affinity\Designer\1.0\user\export_config.dat (Location Assumption) Mac: Affinity Designer (ADe): /Users/{Your User Name}/Library/Containers/com.seriflabs.affinitydesigner/Data/Library/Application Support/Users/ Affinity Photo (APh) : /Users/{Your User Name}/Library/Containers/com.seriflabs.affinityphoto/Data/Library/Application Support/Users/

@Patrick Connor
The thing is, in the video game industry, TGA is kind of a standard (I even think Unreal Engine converts all texture to TGA on import).
Most of my library and libraries out there are composed of TGA with some info on the alpha channel, like transparency for foliage or AO info, etc.
The issue for me is that I cannot import the alpha channel. So for example, say I want to convert my TGA file from 4K to 1K to the suggested PNG-24, the alpha channel info will be gone.
PNG for me is fine, but ONLY if Affinity can read the alpha channel from these TGA files. So if you start to "support transparency of targa files on import", that would be it for me.

@SrPx
Totally agree with you!
Importer is the key here.
The reason why I found this threat in the first place, was when I had to convert my entire foliage library (3000+ textures) from 4k to 512px for use in VR and I was baffled that I could not batch rescale without loosing the alpha channel in AP.
So yes, wish list item, add alpha channel on import for TGA/TIFF.

Thanks for the TGA alpha support!

Affinity Photo support TIFF import/export with alpha channel.
test.tiff

TGA format has now alpha import support in:
Affinity Designer Customer Beta (1.6.1 - Beta 3)
and
Affinity Photo Customer Beta (1.6.1 - Beta 3)
 
 

Status: Customer Beta
Purpose: Improvements, fixes
Requirements: Purchased Mac Affinity Designer [from Mac App Store]
Mac App Store: Not Submitted
Download: Here
 
To use this beta, simply download the file from the link given above and double-click on the file to open the installer. Follow the instructions to install the beta version. The beta sits alongside the Mac App Store version and will not interfere with it.
 
This beta is an iteration of the current App Store release and should be used in preference to the App Store release, if you are affected by any of the issues listed below.
 
Fixes/Improvements:
Fix for failures when using compound objects inside groups with Constraints set on them. Font support improvements - specifically relating to fonts which substitute spaces or have truncated Unicode CMAP tables. Transparent TGA import support. Fix for deleting a node of a bitmap fill causing crash. Improved pixel painting smoothing. Any pixel-based painting tools should now have better smoothing by default. Fix for combo boxes causing crashes for certain users on High Sierra. Fix for exporting JPEG automatically choosing to export clips as paths which is a poor default and causes confusion. Fix for text objects being created outside the hierarchy of the artboard they were supposed to be created in. Fix for rotated text bounding boxes being incorrect and for disappearing text following Power-Duplicate. Fixed sporadic hanging when opening many image files at once. Fixed crashing bug when exporting certain large PSDs. Fixed a number of UI memory leaks. Added special case PSD import code for “SketchClub” PSD files (they should fix this!). Fixed PSD export of Fill layers. Fixed UI labels on macOS versions prior to Mavericks. SVG import can now handle gradients with missing x1 or y1 values. Assorted PDF export improvements. Localisation improvements. Paste and file-drop of PDF format files will now honour the DPI, as per File->Place. Fix for marching ants not showing on a rotated canvas. Miscellaneous other fixes and tweaks.

@SrPx
Totally agree with you!
Importer is the key here.
The reason why I found this threat in the first place, was when I had to convert my entire foliage library (3000+ textures) from 4k to 512px for use in VR and I was baffled that I could not batch rescale without loosing the alpha channel in AP.
So yes, wish list item, add alpha channel on import for TGA/TIFF.

@Patrick Connor
The thing is, in the video game industry, TGA is kind of a standard (I even think Unreal Engine converts all texture to TGA on import).
Most of my library and libraries out there are composed of TGA with some info on the alpha channel, like transparency for foliage or AO info, etc.
The issue for me is that I cannot import the alpha channel. So for example, say I want to convert my TGA file from 4K to 1K to the suggested PNG-24, the alpha channel info will be gone.
PNG for me is fine, but ONLY if Affinity can read the alpha channel from these TGA files. So if you start to "support transparency of targa files on import", that would be it for me.

@Patrick Connor
The thing is, in the video game industry, TGA is kind of a standard (I even think Unreal Engine converts all texture to TGA on import).
Most of my library and libraries out there are composed of TGA with some info on the alpha channel, like transparency for foliage or AO info, etc.
The issue for me is that I cannot import the alpha channel. So for example, say I want to convert my TGA file from 4K to 1K to the suggested PNG-24, the alpha channel info will be gone.
PNG for me is fine, but ONLY if Affinity can read the alpha channel from these TGA files. So if you start to "support transparency of targa files on import", that would be it for me.