As both the PPTX and POTM files are from Microsoft PowerPoint, the most easiest solution would be simply re-save PPTX to POTM using that program. Such pptx to potm conversion will create a template based on the presentation with possible macros enabled.
Home > Search converters: pptx to potm
Conversion of pptx file format to potm file format beta
Search for pptx to potm converter or software able to handle these file types.
Convert Microsoft PowerPoint Open XML presentation to Microsoft PowerPoint macro-enabled Open XML template.
We have found 4 software records in our database eligible for .pptx to .potm file format conversion.
Microsoft Windows software 
- convert pptx to potm on Windows
Microsoft PowerPoint
A presentation program from the Microsoft Office suite
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from pptx file | Yes, Microsoft PowerPoint supports pptx file conversion as a source file type. | Yes | Yes | pptx editor | Yes | No | No | No |
to potm file | No | Yes | Yes | potm editor | Yes | No | No | No |
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned pptx to potm. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software 
- convert pptx to potm on OS X
Microsoft PowerPoint for Mac
Mac version of popular presentation software from Microsoft
Multiplatform software 
- convert pptx to potm on any platform
LibreOffice Impress
Powerful multimedia presentation software tool from LibreOffice suite
Apache OpenOffice Impress (OpenOffice.org Impress)
Free presentation program from OpenOffice.org
Additional links: Open pptx file, Open potm file
PPTX
Files with pptx extension are presentations from modern version of PowerPoint from Microsoft Office / Office 365. PowerPoint slide shows are basically set of screens which can include text, graphic, sounds or videos used for various presentation purposes.
POTM
A potm file extension is related to the Microsoft PowerPoint presentation software. A potm file stores macro-enabled Open XML template.
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