Fix ESP32-Cloudflare R2 Sync

My ESP32 code already handles Wi-Fi, builds the S3-compatible requests, and reaches Cloudflare R2, yet the text files I push never actually appear in the bucket. Authentication is fine, sockets stay open, but the data simply isn’t syncing.
I need a fresh set of eyes to jump on a live remote session (AnyDesk or similar) and trace the problem with me in real time. Your task is to pinpoint the break in the upload flow, adjust the code or headers as needed, and prove the fix by successfully writing and reading back a sample .txt file from R2.

Key points
• Hardware: ESP32 (Arduino framework; can switch to ESP-IDF if you prefer)
• Storage target: Cloudflare R2, S3-compatible API
• Data type in scope: plain text files only—no sensor streams or images right now
• Issue observed: data not syncing even though connection/auth look good

Deliverables
1. Working code snippet or patch that uploads a text file from the ESP32 to R2 and verifies its presence.
2. Brief summary of what was wrong and why your fix works so I can maintain it later.
3. Session recording or notes so I can replicate the steps.

If you’re comfortable debugging embedded HTTPS/S3 flows and can collaborate live, let’s get this sorted today.