@nadifb I'm not sure I'm completely following all of your questions, so please bear with me and clarify whatever I have misunderstood.
- If the item will not save with an error about a disallowed word, that can sometimes be a tricky troubleshooting situation.
Problem is that sometimes it's a flagged term that's a 'naughty' term in other cultures, or there's some other reason that makes no sense to us. So...
You can put the whole description or title or whatever is causing the issue in a text editor and add one word or phrase at a time and try to save until you find the word that triggered the 'disallowed word' warning. - When there is a hashtag in a description that pairs with the word/term after it to create a searchable link per that term in the gallery. If you look through the search/browse options you can search for your term as an "Item Name", "EA ID", or "#Hashtag".
For example, if you searched for "SheriGR" under "EA ID" you would find my gallery items listed via your chosen sort. But, if you searched for "SheriGR" under "#Hashtag", you would bring up anywhere in item descriptions where I (or anyone else) have added the hashtag #SheriGR" into the item description. - "Does this mean someone downloaded and saved it under them or it was just viewed by them?" Could you please clarify what you mean on this?
- There is a good set of instructions for sharing your sim to the library and gallery
at these links:
The Sims Gallery: https://help.ea.com/en-us/help/the-sims/the-sims-4/the-sims-4-gallery/
Using the gallery: https://www.carls-sims-4-guide.com/gallery/
Hope that helps. Feel free to ask further/clarification questions. Screenshots may be helpful if a question is hard to word.