Displaying the images of one directory in the browser works very well: Thank you for this.
I am missing an easy way to jump from one day to the next.
Example
I have seen all images in 2017/2017-02/2017-02-17/ now I want to show the images of your next holiday which are in 2017/2017-02/2017-02-18/.
Is there an easy way (maybe a short-cut like shift-left of shift-page-down) to go the next directory?
BTW: I am unsure which category to choose for this question. I used "oC server" since this is not a sync or android question. Please change it, or let me know, if it is wrong.
This function is very likely not implemented yet. You need to put a feature request or even do it yourself. To put a feature request, please use the repository on github: https://github.com/owncloud/gallery/issues
There are mainly users active / online here so a "i understand what you want" from a user probably doesn't help that much, or am i wrong?
If you're looking for a new feature / want to suggest a new feature please follow the advice of @tflidd above and use the specific github issue trackers (Not only for the mentioned gallery app but for every part of ownCloud).