Hi @Olga Andreeva,
You could refer to following api to search file.
POST https://graph.microsoft.com/v1.0/search/query
{
"requests": [
{
"entityTypes": [
"driveItem"
],
"query": {
"queryString": "filename:fir.txt AND path:\"https://tenant-my.sharepoint.com/sites/xxx/Documents/folder\""
}
}
]
}
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