Does the link have extention of the photo like .jpg, .png or similar. If yes, then you don’t need any coding but simple link. Embeding actually doesn’t work in this software ordinary way.
Also, almost all services don’t support that picture would still be visible if you’ve moved it somewhere else however DropBox fom approximately year ago does support this. So if you moved photos around your library it very easily is that it’s not visible anymore especially if you’ve moved them to the folder which isn’t publicly shared.
I’m sorry but all these aspects have to be considdered when posting photo on here which is stored somewhere else so it maybe worth to organize libraries before you post particular picture somewhere.
To be honest, I’m not familiar with how things are going on iDevices. I never used them. But I believe things shouldn’t be much different though.
Just in case anyone catches this, plygain tonight 19.00 at Dinas Maddway.
More realistically, you can catch an event a week today at the church in Mallwyd, also 19.00. I went last year; the church was still decorated for Christmas, and it was snowing heavily - magical!