how to get file_id, file_size metadata using filename gotten from file chooser (python)

Can you share the rest of your Chooser code? Accessing .id on the returned file object should give you the file ID.

Also, thumbnailLink is a URL that points to the data for the thumbnail. What you with that is up to you. E.g., you can make an HTTPS request to it to download the thumbnail data, and display it in your app.

Here is what I have:

<script type="text/javascript" src="https://www.dropbox.com/static/api/2/dropins.js" id="dropboxjs" data-app-key="kuxx5m7ap1npv24"></script>
<script>
var options= {
multiselect: true,
//extensions: ['.png', '.jpg', '.mvp3', '.mvp4', '.doc', '.xls'],
linkType: 'preview',
success: function(files) {

var filenames;
var filepaths;
var fileids;
var filesizes;
var fileicons;
var filethumbnails;
 
//Parse file names and file paths from files. Store data into arrays.
var obj = files;

filenames=obj.name;
filepaths=obj.link;
fileicons=obj.id;
filesizes=obj.size;
fileicons=obj.icon;
filethumbnails=obj.thumbnailLink;
 
document.getElementById('linkfile').value = filepaths; 
document.getElementById('namefile').value = filenames;
document.getElementById('idfile').value = fileids;
document.getElementById('sizefile').value = filesizes;
document.getElementById('iconfile').value = fileicons;
document.getElementById('thumbnailfile').value = filethumbnails;
 
alert(filepaths);
alert(filenames);
alert(fileids); 
alert(filesizes);
alert(fileicons);
alert(filethumbnails);
};
},
};
$(document).ready(function() {
var button = Dropbox.createChooseButton(options);
document.getElementById('uploadDB').appendChild(button);
});
</script>
<div id="uploadDB"></div>

I can get name, link, icon/thumbnail not size and nor id.

Q.