Preserve source clip's native frame rate when reconnecting high-res in a proxy-first workflow with mismatched frame rates

In a proxy-first or proxy-only ingest workflow, when a 25i high-resolution source is later connected to a pre-existing 50p proxy, Premiere Pro incorrectly inherits the proxy's interpreted frame rate (50fps) and applies it to the 25i source, causing it to play back at double speed.

Importantly, this issue does not occur in the reverse workflow: when a 25i source is ingested first and a 50p proxy is generated from it, toggling between proxy and high-res works correctly. The problem is exclusive to the proxy-first path.

Context:
This is a real and growing workflow challenge for broadcasters and post-production facilities transitioning from interlaced (25i) to progressive (50p) acquisition. Archive footage shot in 25i must regularly be cut alongside new 50p material. Using 50p proxies for archive 25i clips is desirable because:

• All 50 fields per second are represented as individual frames, enabling frame-accurate editing

• Progressive proxies play back more efficiently on laptops and office workstations

• It creates a uniform editing environment across 25i archive and new 50p acquisition

The high-res source must remain native 25i for broadcast delivery and archival integrity — re-interpreting it as 50fps is not acceptable.

Request:
When reconnecting high-res media to a proxy in a proxy-first workflow, add an option to preserve the native frame rate of the source file rather than inheriting the proxy's interpreted frame rate. This could be implemented as:

• A per-clip option in the Attach/Reconnect Full Resolution Media dialog

• A project-level preference: "On reconnect, use source file's native frame rate"

• An automatic fallback when the source file's container frame rate differs from the proxy's interpreted rate

Expected behavior:

• Toggle to proxy → clip plays at 50p (proxy rate)

• Toggle to high-res → clip plays at native 25i (source file rate), without speed distortion and without requiring manual Interpret Footage correction on every clip