const MEDIA_MAX_BYTES = 5 * 1024 * 1024;

Files larger than 5 MB (e.g. large PDFs, PowerPoint files, images) cannot be
copied into the sandbox container and silently fail or are rejected.

This constant has been hardcoded since at least v2026.3.7 and is still present
in v2026.3.8.
Expected Behavior
MEDIA_MAX_BYTES should be user-configurable via openclaw.json, for example:
{
"tools": {
"media": {
"maxBytes": 524288000
}
}
}

The existing tools.media.image.maxBytes and tools.media.audio.maxBytes
per-type config keys suggest the infrastructure already supports per-type limits,
but there is no way to override the sandbox staging cap that applies before
the per-type check.

### Steps to reproduce

Configure a sandboxed agent (sandbox.mode: "non-main")
Send a file larger than 5 MB (e.g. a 10 MB PDF or PPTX)
Observe the file is rejected / not available inside the sandbox

### Expected behavior

MEDIA_MAX_BYTES should be user-configurable via openclaw.json, for example:
{
"tools": {
"media": {
"maxBytes": 524288000
}
}
}

The existing tools.media.image.maxBytes and tools.media.audio.maxBytes
per-type config keys suggest the infrastructure already supports per-type limits,
but there is no way to override the sandbox staging cap that applies before
the per-type check.

Steps to Reproduce
Configure a sandboxed agent (sandbox.mode: "non-main")
Send a file larger than 5 MB (e.g. a 10 MB PDF or PPTX)
Observe the file is rejected / not available inside the sandbox
Workaround
Manually patch dist/store-*.js after every npm install -g openclaw update:
sed -i 's/const MEDIA_MAX_BYTES = 5 \* 1024 \* 1024/const MEDIA_MAX_BYTES = 500 * 1024 * 1024/' \
$(find $(npm root -g)/openclaw/dist -name "store-*.js")
openclaw gateway restart

### Actual behavior

Files larger than 5 MB (e.g. large PDFs, PowerPoint files, images) cannot be
copied into the sandbox container and silently fail or are rejected.

This constant has been hardcoded since at least v2026.3.7 and is still present
in v2026.3.8.

### OpenClaw version

2026.3.8

### Operating system

ubuntu 24

### Install method

npm

### Logs, screenshots, and evidence

```shell