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I have a indoor bonsai in a shallow container- have had this about 2 months- leafy kind that would get tiny white flowers, usually one at a time.
was very "happy" until the last couple weeks, now dropping many leaves.
Of course, with the weather change we have moved it indoors- it is drier and not as sunny- we are going to move it to a sunnier window and see if that helps- we have kept it wet, ( the bonsai master said you can never overwater ?) and misted- said to not fertilze until after the 1st the year. It is just going dormant or ? I do not see any indication of infestation, fungus, etc. I have tons of outdoor flowering plants and am considered to have a "green thumb", so I am familiar with plant care----do you think the sunnier location will help or??

thanks!

When you post a picture the experts here can help you better.

I don't see anywhere to upload??

Instructions for posting pictures here are in New to Helpful Gardener? under Helpful Tips and Suggestions for New Members. Bottom line is that you can't upload them directly from your computer, they have to be already on line at some photo hosting site.

The person who gave you that advice is a "bonsai master" and I am definitely not, not even a bonsai grower, but I never heard anyone else say you cannot over-water anything, except pond plants.

At a total guess, one possibility for your indoor bonsai with little white flowers is serissa and they definitely like to dry out a bit between waterings:

https://www.shbonsai.com/care_serissa.html

As a guess only I agree with RG of serrisa.

Not many people inherently have space indoors suitable to growing trees.

Parking your tree even it it is supplied with largely inorganic soil, near a window does not a biome make.

For every successful indoor grower (and there are a few) perhaps as many as one thousand fail.

There is specific citation (with links and photos) here of a grower who is successful exclusively growing his trees indoors.

I do overwinter my tender trees under lights and with all the adaptation I can make only marginally keeps them alive from october to May.

Leaf drop is as you assess a symptom of stress. Your light level is likely too low. Air too dry. And soil likely too wet. These three conditions keep me in cheep pots at the local church bazzar.

You can address the horticultural needs of your tree, or not. S'up to you.

I agree. Tropicals do need a lot of warmth and light. Tropicals with tiny white flowers and Fukien tea; Serissa; Jasmine etc. - are difficult to grow in winter.
Often; there’s a draft near windows; most plants do not like that. My Serissa always get yellow leafs when I bring it inside for the winter; they are very fussy. (I have it only for 2 years now).
The good thing is; that the plant –Serissa- recovers pretty quickly. But that only happens in the right circumstances; give it a lot of light; no drafts; warmth.
They do not like being wet all the time! Search for the chopstick method; that will help you.

Good luck!