Cell phones show this can be done: you can pick individual files ot sets of files using system file picker, and that one file (and only that file!) is opened for browser.
If it needs more, there is always "access all photos" permission, and "access all files" too.. but this is explicit and requires user prompt. And the last part ia very important - if freshly installed browser requires full files access without explanation, this is likely for spyware, so uninstall it and leave bad review.
If it needs more, there is always "access all photos" permission, and "access all files" too.. but this is explicit and requires user prompt. And the last part ia very important - if freshly installed browser requires full files access without explanation, this is likely for spyware, so uninstall it and leave bad review.