Upload failed: The request signature we calculated does not match the signature you provided

I have reviewed the other posts in this forum with the same issue, but have not found any with solutions.

ISSUE: When accessing my Pydio Cells remotely, I am unable to upload any files larger than 100MB. No issues if I upload smaller files. Larger files result in this error:

“Upload failed: The request signature we calculated does not match the signature you provided. Check your key and signing method.”

I am able to upload files without issue from when I accesses it locally,

[Windows] Pydio Server > [Raspberry pi 4 4GB] NGINX Reverse Proxy w/ssl > WAN

External URL set in Pydio Console > Main Settings w/o port number as other posts suggest. See picture here:

NGINX setup: (I just used the official doc setup and changes my certs and domain information, everything else is stock.

server {
server_name cells.example.com;

# Allow any size file to be uploaded.
client_max_body_size 0;
# To disable buffering
proxy_buffering off;

location / {
    # Uncomment this to enable gRPC and thus be able to use cells-sync
    #if ($http_content_type = "application/grpc") {
    #    grpc_pass grpcs://cells:8080;
    proxy_pass https://cells:8080;

location /ws/ {
    proxy_pass https://localhost:8080;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "Upgrade";

error_log /var/log/nginx/cells-proxy-error.log;
access_log /var/log/nginx/cells-proxy-access.log;

listen [::]:443 ssl;
listen 443 ssl http2;

# certificate configuration (in this case generated by certbot)
ssl_certificate /etc/letsencrypt/live/my-cells-server.com/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/my-cells-server.com/privkey.pem;
include /etc/letsencrypt/options-ssl-nginx.conf;
ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;


server {
if ($host = cells.example.com) {
return 301 https://$host$request_uri;

    listen 80;
    listen [::]:80;
    server_name cells.example.com;
    return 404;

Any help would be appreciated. This setup is working so well, except for this dang upload issue. Please advise.

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