Reproduction steps:

1. Open "ReproBugProject.zip" project
2. Build & Run for Android with Developer options enabled
3. On the device, press on the green pin

Expected Result: A video loads and starts playing
Actual Result: Unknown Error

Reproduced with: 2019.1.5f1, 2018.4.1f1, 2018.3.14f1, 2018.3.0a1
Did not reproduce on: 2019.3.0a5, 2019.2.0b5, 2019.2.0b1, 2019.2.0a5, 2019.2.0a1, 2017.4.28f1

Reproduced on Devices:
VLNQA00104, Lge Nexus 5 (Nexus 5), Android 6.0.1, CPU: Snapdragon 800 MSM8974, GPU: Adreno (TM) 330
VLNQA00218, Samsung Galaxy Note9 (SM-N960U), Android 8.1.0, CPU: Snapdragon 845 SDM845, GPU: Adreno (TM) 630
VLNQA00057, Htc One M9+ (HTC_M9pw), Android 5.0.2, CPU: MediaTek Helio X10 MT6795T, GPU: PowerVR Rogue G6200
VLNQA00272, Samsung Galaxy S10+ (SM-G975U), Android 9, CPU: Snapdragon 855 SM8150, GPU: Adreno (TM) 640
VLNQA00103, Samsung Galaxy Note8 (SM-N950F), Android 7.1.1, CPU: Exynos 9 Octa 8895, GPU: Mali-G71

Error:
Line 11218: 06-06 19:24:57.248 799 10999 E tftp_server: pid=799 tid=10999 tftp-server : ERR :[tftp_server.c, 1718] open failed : [-2] [Unknown error -2]
Line 17961: 06-06 19:26:27.275 11775 11796 I Unity : Unknown Error