Thanks for the suggestion
Please correct me if I am wrong but I do not think PicApport is open source, or is it?
Not that I am opposed to the idea, on the contrary as I think Cloudron could do with a better photo/video management app (other than Lychee).
Yet accessible source is still, in my opinion, a massive point for the integration of an app on Cloudron over another. Which is why, at this stage, my preference would go for something like Piwigo as an alternative (to Lychee / Photoprism - if still not integrable).
Of course, the above is moot if PicApport is indeed open source and I simply did not find it.
Also, the mention "Free for private users" on their website (they also mention to contact them for using the app as a company) makes me think that PicApport might not be suitable to the extend of use-cases that Cloudron is being used with. Other Cloudron users here might also have better insight.