Correct folder layout (recommended)
=====================================
RELEASE/TFM/R-Scope/
  R-Scope.php
  rscope-paths.php
  scope-proxy.php
  root-proxy.php
  .htaccess
  lib/
    rscope-lib.php
    fl-meta.php
  config/
    rscope.json

Flat upload (your FTP screenshot) also works IF these exist in R-Scope/:
  rscope-paths.php
  rscope-lib.php  OR  lib/rscope-lib.php
  fl-meta.php     OR  lib/fl-meta.php
  rscope.json     OR  config/rscope.json

Do NOT put in R-Scope/ (wrong place):
  public_html/root-proxy.php  → belongs in public_html/
  public_html/lib/rscope-resolve.php
  r-scope-check.php duplicate with broken require paths

Web entry URL:
  https://lab.rnote.jp/root-proxy.php

NOT reliable on all hosts:
  https://lab.rnote.jp/RELEASE/TFM/R-Scope/R-Scope.php  (may HTTP 500)