There are different behaviours depending on the browser used with Android (6.0.1, Samsung S5mini):
Sending a picture by mail using the share-buttom:
Chrome: The link to the specific picture is sent
Firefox: The link to the album, not to the specific picture is sent (the part #img=xxxx is missing)
Native browser: The link to the specific picture is sent
Sending a picture by mail using the context menu, opened by putting the finger on the picture:
Chrome: The original of the picture is sent as attachement
Firefox: The specific link to the picture is sent together with the original of the picture as attachement
Native browser: The original of the picture is sent as attachement
To share a specific picture the share-buttom is not wprking properly with all browser.
Sending a picture by mail using the context menu, opened by putting the finger on the picture, is working with all browsers.
I believe this behavior is some kind of security precaution - when passing links to mail client these browsers simply remove the hash. Unfortunately I can't work around this. Perhaps later I will make a server-based mail sending tool, but until then I can't fix this, I'm afraid.
That means: We have to accept this behaviour until your new server-based solution. So: I do not show the "share" button in my future albums. Then it is up the the user to download / share the album and specific pictures using the specific context-menu each browser is offering.
It IS offered by all browsers: Open the album in a browser and then you can share the URL using the browser-functionality with mail, whatsapp, g+, .... or whatever you have installed on your phone. And (for example with Chrome on Android) you can put your finger on an opened picture and then a context menu appears offering you "download picture" or "share picture".
And then you can share ONLY THIS picture with mail, whatsapp, g+, ....
Yes - on desktops you have to copy / paste the URL of the album to share it. And if you open a specific picture with Chrome and Firefox you also have a context menu with the option to copy the URL of the picture to share only this picture. BUT: Using EDGE there also the option "copy link" and "save picture as" is available - but does not work with the tiger-skin as described in https://jalbum.net/forum/message.jspa?messageID=321346#321346
Funny: My Chome (WIN10 PC) is showing this options with a rightclick on the picture:
Open picture in new tab
Save picture as ....
Copy adress of picture
Search for picture with Goggle
All this options are doing what they are supposed to do, and this are different actions: "Save picture as ...." is downloading the picture on the PC. "Copy adress of picture" copies the URL of the picture (to share the URL for example with whatsapp)