My earlier understanding was that Participle phrases act as only adjectives. Many web sources say that way. However, there are many sources which say they act as adjectives and adverbs.
Example: Smiling from ear to ear, Anne opened the present. In the above example, the source takes it as an adjective which modifies Anne.
The source goes on with similar examples and there is no mention of adverbial function.
Example: Singing a silly song, we walked along the sidewalk. Here as well, another source takes the participle as an adjective modifying 'we'. If we ask the question "how we walked" it could be an adverb, modifying the independent clause "we walked along the sideway".
The following website also says Participle phrases as adjectives. https://www.thoughtco.com/what-is-a-participial-phrase-1691588
Now, we have some other sources that take participle phrases as adverbs along with adjectives.
Example: 'Bored from what she saw, Kate turned off the TV.' Here, instead of taking it as an adjective which modifies Kate, (as in the other examples) the phrase has been taken as an adverb that answers "Why did Kate turn off the TV?'
I would like your thoughts on this.
PS: Of course, there is another way (the second way) that participles function as adjectives like in 'shining star' or 'dancing girl.'