When viewing a candidate, you have the ability to add or update the resume they have on file with you.

Click a candidate's name on an interview card to be taken to their profile.

On their candidate profile, select Actions > View/edit avatar

If you don't currently have an avatar picture on file for the candidate, you'd simply select a file to upload or drag and drop it in the uploader. The picture will appear once it's done processing and you'll have the opportunity to crop and/or rotate the image. When you're happy with the cropped version, click Finish.

If you already have an avatar picture on file for the candidate, select or drag and drop the file into the uploader next to the existing avatar to overwrite the image. The picture will appear once it's done processing and you'll have the opportunity to crop and/or rotate the image. When you're happy with the cropped version, click Finish.